Tham khảo Tuyệt_chủng_loài_người

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  2. Sagan, Carl (1983). “Nuclear war and climatic catastrophe: Some policy implications”. Foreign Affairs. 62 (2): 257–292. doi:10.2307/20041818. JSTOR 20041818.
  3. 1 2 Parfit, D. (1984) Reasons and Persons. Oxford: Clarendon Press.
  4. Adams, Robert Merrihew (tháng 10 năm 1989). “Should Ethics be More Impersonal? a Critical Notice of Derek Parfit, Reasons and Persons”. The Philosophical Review. 98 (4): 439–484. doi:10.2307/2185115. JSTOR 2185115.