APA (7th ed.) Citation

Walker, K. (1969). The physiology of sex and its social implications (2nd ed. rev.). Penguin Books.

Chicago Style (17th ed.) Citation

Walker, Kenneth. The Physiology of Sex and Its Social Implications. 2nd ed. rev. Harmondsworth, Middlesex: Penguin Books, 1969.

MLA (8th ed.) Citation

Walker, Kenneth. The Physiology of Sex and Its Social Implications. 2nd ed. rev. Penguin Books, 1969.