David Hume book A Treatise of Human Nature
Part 2, Section 12
A Treatise of Human Nature (1739-40), Book 2: Of the passions
volume I, chapter II: "Comparison of the Mental Powers of Man and the Lower Animals", pages 41-42 http://darwin-online.org.uk/content/frameset?pageseq=54&itemID=F937.1&viewtype=image <br class="br">The Descent of Man (1871)
David Hume book A Treatise of Human Nature
Part 2, Section 12
A Treatise of Human Nature (1739-40), Book 2: Of the passions
Harry Harlow (1905–1981) American psychologist
Interview with Pittsburgh Press-Roto, 1974. Quoted in Blum, Deborah. The Monkey Wars. Oxford University Press, 1994, p. 92.
Rupert Sheldrake (1942) English biochemist, author and parapsychological researcher
Seven Experiments That Could Change the World (London: Fourth Estate, 1994), p. 24.
George Monbiot (1963) English writer and political activist
"Goodbye – and good riddance – to livestock farming" https://www.theguardian.com/commentisfree/2017/oct/04/livestock-farming-artificial-meat-industry-animals, The Guardian, 4 October 2017.
Rocco Siffredi (1964) Italian pornographic actor, director, producer and entrepreneur
Interview by Andrea Di Marcantonio
Charles Darwin book The Descent of Man, and Selection in Relation to Sex
volume I, chapter II: "Comparison of the Mental Powers of Man and the Lower Animals", page 46 http://darwin-online.org.uk/content/frameset?pageseq=59&itemID=F937.1&viewtype=image <br class="br">The Descent of Man (1871)
Roger A. Caras (1928–2001) American photographer
"We Must Find Alternatives to Animals in Research," in Newsweek (26 December 1988)