Perry, G. (2017). The descent of man. Penguin Books.
Cita Chicago (17th ed.)Perry, Grayson. The Descent of Man. London: Penguin Books, 2017.
Cita MLA (9th ed.)Perry, Grayson. The Descent of Man. Penguin Books, 2017.
Atenció: Aquestes cites poden no estar 100% correctes.