Cita APA (7a ed.)

Webster, D., & Webster, G. S. (1984). Optimal hunting and Pleistocene extinction. [s.n.].

Cita Chicago Style (17a ed.)

Webster, David, y Gary S. Webster. Optimal Hunting and Pleistocene Extinction. [S.l.]: [s.n.], 1984.

Cita MLA (9a ed.)

Webster, David, y Gary S. Webster. Optimal Hunting and Pleistocene Extinction. [s.n.], 1984.