Online

• PhilPapers – Database
  A “directory of online philosophy articles and books by academic philosophers” in all areas of philosophy. An excellent source for current awareness of what is happening in philosophical research.
• Stanford Encyclopedia of Philosophy
  Far superior to Wikipedia and more in-depth than the Internet Encyclopedia of Philosophy. This is a comprehensive, scholarly, continuously updated encyclopedia of philosophy written by leading experts in the field.
• Routledge Encyclopedia of Philosophy
  A useful encyclopedia of philosophy in general with a good selection of material related to ancient philosophy in particular.
• Internet Encyclopedia of Philosophy.
  Useful for background information. More general but broader in scope than Stanford Encylopedia of Philosophy
• Philosophy Compass
  Full text review journal for all areas of the discipline; includes searchable abstracts of subject related journals
• Ancient Philosophy: A Very Short Introduction.Annas, Julia. 2000.
  An excellent, accessible introduction to what the ideas, methods and approaches to ancient philosophy.
• Phronesis: a journal for ancient philosophy.
  Classmark: PER B 1.P94
  One of the leading journals for the study of ancient philosophy. Issues from 1955-2016 accessible online via link above. The newest issues are on the library shelves.
• Oxford Studies in Ancient Philosophy.
  Classmark: PER B 108.08
  The leading journal of the study of ancient philosophy. Issues from 2012-Presentavailable online. Others available on the shelves.
• The Cambridge Companion to Greek and Roman Philosophy.Sedley, David, ed. Cambridge: Cambridge University Press, 2003.
  Contains a glossary of philosophical terms. Covers the pre-Socratics to Late Antiquity.
• The Cambridge Companion to Early Greek Philosophy.Long, A. A., ed. Cambridge: Cambridge University Press, 1999.
  Good introduction to the study of the Presocratics both in terms of individuals and methods.
• The Oxford Handbook of Presocratic Philosophy, edited by Curd, Patricia, and Daniel W. Graham. Oxford University Press, 2008-10-30. 
  Provides good discussion of recent approaches to Presocratic philosophy.
• The Cambridge Companion to Ancient Greek and Roman Science.Taub, Liba, ed. Cambridge: Cambridge University Press, 2020.
  Provides wide ranging discussion of recent approaches to Ancient Science.
• The Cambridge Companion to Socrates. Morrison, Donald R. Cambridge Companions to Philosophy. Cambridge: Cambridge University Press, 2010.
  A collection of essays that explore the life and importance of Socates.
• The Cambridge Companion to Plato.Kraut, Richard, ed. Cambridge Companions to Philosophy. Cambridge: Cambridge University Press, 1992.
  A collection of essays that explore Plato and platonism. See also the Cambridge Companion to the Republic.
• The Cambridge Companion to the Stoics.Inwood, Brad, ed. Cambridge Companions to Philosophy. Cambridge: Cambridge University Press, 2003.
  A collection of essays that explore the origin and development of stoicism in Greece & Rome.
• The Cambridge Companion to Ancient Scepticism. Bett, Richard, ed. Cambridge Companions to Philosophy. Cambridge: Cambridge University Press, 2010.
  Explores the development of scepticism in antiquity after Plato.
• The Cambridge History of Philosophy in Late Antiquity. Vols. 1-2. Gerson, Lloyd P., ed. Cambridge: Cambridge University Press, 2000. 
  Vol. 1 to Augustine
  Vol. 2 to Medieval Philosophy A wide-ranging and detailed exploration of philosophy in the Roman era and beyond.
• Pursuits of Wisdom: Six W>a>ys of Life in Ancient Philosophy from Socrates to Plotinus>.Cooper, John M. Princeton University Press, 2012.
  Explores how ancient philosophies, which focus on eudaimonia as the goal of life, can be conceived of a way of life.

In Print

• A companion to ancient philosophy>.> Gill, Mary Louise & Pellegrin, Pierre. Oxford: Blackwell Pub., 2006.
  Classmark: B 111 GIL
  Useful introduction to methods and ideas in ancient philosophy.
• A History of Greek Philosophy. Guthrie, W.K.C. New York: Cambridge University Press, 1962-1981. 6 vols.
  Classmark: B 171 GUT V.1-5
  Still the standard work in English on Greek philosophy from the Pre-Socratics to Aristotle.
  Vol. 1. The earlier Presocratics and Pythagoreans
  Vol. 2. The Presocratic tradition from Parmenides to Democritus
  Vol. 3. The fifth-century enlightenment
  Vol. 4. Plato, the man and his dialogues
  Vol. 5. The later Plato and the academy
  Vol. 6. Aristotle, an encounter.
• Ancient philosophy: a contemporary introduction. Shields, Christopher John. New York: Routledge, Taylor & Francis Group, [2012]
  Classmark: B 171 SHI
  Basic introduction to ancient philosophy.
• Ancient philosophy. Kenny, Anthony. Oxford : Clarendon, 2006.
  Classmark: B111 KEN
  Sets out some of the key issues in ancient philosophy.
• Resources in Ancient Philosophy: An Annotated Bibliography of Scholarship in English, 1965-1989. Bell, Albert A., Jr., and James B. Allis. Metuchen, NJ: Scarecrow Press, 1991.
  Classmark: Z 7128.A53 BEL
  Old, but useful list of works in ancient philosophy. Sets out the importance of key works.
• New Purchase? Greek Thought: A Guide to Classical Knowledge. Brunschwig, Jacques and Geoffrey E. R. Lloyd. Cambridge, Mass.: Belknap Press of Harvard University Press, 2000.
• Greek Philosophical Terms: A Historical Lexicon. Peters, F. E. New York: New York University Press, 1967.
  Classmark: B 49 PET
  This lexicon of Greek terminology will help students understand where ancient Greek notions differ substantially from those we tend to use in English when we discuss ancient philosophy. It will also help understand the Greeks on their own terms for students who don’t know Greek.
• Feminism and ancient philosophy. Ward, Julie K. New York; London: Routledge, 1996.
  Classmark: HQ 1190 WAR
  Explores feminist readings (and problematic readings) in ancient philosophy.
• How to be a stoic: using ancient philosophy to live a modern life. Pigliucci, Massimo. New York : Basic Books, 2018. Classmark: B 528 PIG
  Explores the notion of lived stoicism.
• The recovery of ancient philosophy in the Renaissance: a brief guide.
  Firenze: L.S. Olschki 2008.
  Classmark: B 181 HAN
  A guide to the western ‘rediscovery’ of ancient philosophy.
• Readings in ancient Greek philosophy: from Thales to Aristotle. Cohen, S. Marc; Curd, P. & Reeve, C.D.C. eds. & trans. Indianapolis, Ind.: Hackett, 2011.
  Classmark: B 171 COH
  An anthology of major works of Greek philosophy.
• Ancient Western philosophy: the Hellenic emergence. McLean, George F. New York: Appleton-Century-Crofts, 1971.
  Classmark: B 171 MAC
  A dated, but instructive look at one view of the emergence of philosophy in Greece.
• Ancient concepts of philosophy. Jordan, Robert William. London: Routledge, 1990.
  Classmark: B 178 JOR
  Attempts to build a broad context for understanding ancient philosophy. Written for 2/3rd year undergraduates in philosophy & classics.
• Byzantine philosophy and its ancient sources. Ierodiakonou, Katerina. Oxford: Clarendon Press ; New York : O.U.P., 2002. Classmark:  B 722.B97 B98 IER
  Explores the ancient origins of Byzantine philosophy.