McShea, R. J., & McShea, D. W. (n.d.). Biology and Value Theory. In J. Maienschein & M. Ruse (Eds.), Biology and the Foundation of Ethics (pp. 307–328). Cambridge University Press. https://doi.org/10.1017/cbo9780511609077.013

McShea, Robert J., and Daniel W. McShea. “Biology and Value Theory.” In Biology and the Foundation of Ethics, edited by Jane Maienschein and Michael Ruse, 307–28. Cambridge University Press, n.d. https://doi.org/10.1017/cbo9780511609077.013.

McShea RJ, McShea DW. Biology and Value Theory. In: Maienschein J, Ruse M, editors. Biology and the Foundation of Ethics. Cambridge University Press; p. 307–28.

McShea, Robert J., and Daniel W. McShea. “Biology and Value Theory.” Biology and the Foundation of Ethics, edited by Jane Maienschein and Michael Ruse, Cambridge University Press, pp. 307–28. Crossref, doi:10.1017/cbo9780511609077.013.

McShea RJ, McShea DW. Biology and Value Theory. In: Maienschein J, Ruse M, editors. Biology and the Foundation of Ethics. Cambridge University Press; p. 307–328.