Williams 2009, p. 291. Williams, Bernard (2009) [1982]. "The Point of View of the Universe: Sidgwick and the Ambitions of Ethics". The Sense of the Past: Essays in the History of Philosophy. Princeton University Press. pp. 277–296. doi:10.1515/9781400827107.277. ISBN978-0-691-13408-6.
Medema 2008. Medema, Steven G. (1 December 2008). ""Losing My Religion": Sidgwick, Theism, and the Struggle for Utilitarian Ethics in Economic Analysis". History of Political Economy. 40 (5): 189–211. doi:10.1215/00182702-2007-066.
Schultz, Barton (2020). "Henry Sidgwick". The Stanford Encyclopedia of Philosophy. Metaphysics Research Lab, Stanford University. Retrieved 29 December 2020.
Schultz 2019. Schultz, Barton (2019). "Henry Sidgwick". The Stanford Encyclopedia of Philosophy. Metaphysics Research Lab, Stanford University. Retrieved 10 February 2020.