Perry, G. (2017). The descent of man. Penguin Books.
Lua i Stíl Chicago (17ú heag.)Perry, Grayson. The Descent of Man. London: Penguin Books, 2017.
Lua MLA (9ú heag.)Perry, Grayson. The Descent of Man. Penguin Books, 2017.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.