APA-referens (7:e uppl.)

Barzun, J. (1981). Darwin, Marx, Wagner: Critique of a heritage (Rev. 2nd ed.). Doubleday Anchor Books.

Chicago-referens (17:e uppl.)

Barzun, Jacques. Darwin, Marx, Wagner: Critique of a Heritage. Rev. 2nd ed. N.Y: Doubleday Anchor Books, 1981.

MLA-referens (9:e uppl.)

Barzun, Jacques. Darwin, Marx, Wagner: Critique of a Heritage. Rev. 2nd ed. Doubleday Anchor Books, 1981.