Παραπομπή APA

Johnson, W. (1968). Conditions of Man. Houghton Mifflin.

Παραπομπή Chicago Style

Johnson, Willoughby. Conditions of Man. Boston: Houghton Mifflin, 1968.

Παραπομπή MLA

Johnson, Willoughby. Conditions of Man. Houghton Mifflin, 1968.