Tham khảo Đẳng cấp loài

↑ An Introduction to the Principals of Morals and Legislation, Jeremy Bentham, 1789 ("printed" in 1780, "first published" in 1789, "corrected by the Author" in 1823.
1 2 Chú thích trống (trợ giúp)
↑ Peter Singer, Animal Liberation, Chapter I, pp. 7–8, 2nd edition, 1990.
↑ “Mill's "On Nature"”. www.lancaster.ac.uk. 1904. Truy cập ngày 9 tháng 8 năm 2015.

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