Pimm, S. L., & Gilpin, M. E. (1989). 20. Theoretical Issues in Conservation Biology. In Perspectives in Ecological Theory (pp. 287–305). Princeton University Press. https://doi.org/10.1515/9781400860180.287

Pimm, Stuart L., and Michael E. Gilpin. “20. Theoretical Issues in Conservation Biology.” In Perspectives in Ecological Theory, 287–305. Princeton University Press, 1989. https://doi.org/10.1515/9781400860180.287.

Pimm SL, Gilpin ME. 20. Theoretical Issues in Conservation Biology. In: Perspectives in Ecological Theory. Princeton University Press; 1989. p. 287–305.

Pimm, Stuart L., and Michael E. Gilpin. “20. Theoretical Issues in Conservation Biology.” Perspectives in Ecological Theory, Princeton University Press, 1989, pp. 287–305. Crossref, doi:10.1515/9781400860180.287.

Pimm SL, Gilpin ME. 20. Theoretical Issues in Conservation Biology. Perspectives in Ecological Theory. Princeton University Press; 1989. p. 287–305.