Ellen, R. 2022. How Nuaulu sago palms feature in debates around the measurement of plant use and valuation. In The cultural value of trees: folk value and biocultural conservation (ed.) J. Wall, 177-190. London and New York: Routledge Earthscan.

Ellen, R. (2021). Nuaulu use and management of culturally salient polymorphisms in Codiaeum variegatum: explaining the biocultural dimensions of leaf variegation in a Southeast Asian ornamental. Journal of Ethnobiology 41 (2). pp. 229-246.  

Ellen, R. (2021). Thinking through nostalgia in anthropologies of the environment and ethnographies of landscape. In Ecological nostalgias: memory, affect and creativity in times of ecological upheavals (eds) O. Angé and D. Berliner, 17-38. Oxford: Berghahn.

Ellen, R. (2021). Nature wars: essays around a contested concept. New York, Oxford: Berghahn.

Ellen, R. (2020). The Nuaulu world of plants: ethnobotanical cognition, knowledge and practice among a people of Seram, eastern Indonesia. [Royal Anthropological Institute Monograph Series 3] Canon Pyon: Sean Kingston Publishing.

Ellen, R. (2020). Cultivar diversity and management as traditional environmental knowledge. In The Routledge handbook of indigenous environmental knowledge (eds) T.F. Thornton, and S.A. Bhagwat, 46-56. Abingdon, Oxfordshire: Routledge.

Ellen, R. (2019). Ritual, landscapes of exchange, and the domestication of Canarium: a Seram     case study. Asian Perspectives 58 (4), 261-86.

Ellen, R. (2019). Transmitting symbolic concepts from the perspective of cultural cognition – the acquisition and transfer of folk-biological knowledge. In Finding, inheriting or borrowing? The construction and transfer of knowledge in antiquity and the middle ages, eds., J. Althoff, D. Berrens and T. Pommerening. [Mainz Historical Cultural Sciences, 39]. Bielefeld: Transcript Verlag, pp. 41-70.

Ellen, R. (2018). Comment on ‘Revamping the metaphysics of ethnobiological classification’ by David Ludwig. Current Anthropology 59 (4), 424-426.

Ellen, R. (2017). Contingency and adaptation over five decades in Nuaulu forest-based plant knowledge, in Indigenous knowledge: enhancing its contribution to natural resource management, ed. P. Sillitoe. Wallingford: CAB International, 28-39.