APA-referens (7:e uppl.)

Shepard, P., & McKinley, D. (1971). Environmental essays on the planet as home. Houghton-Mifflin.

Chicago-referens (17:e uppl.)

Shepard, Paul, och Daniel McKinley. Environmental Essays on the Planet as Home. Boston: Houghton-Mifflin, 1971.

MLA-referens (9:e uppl.)

Shepard, Paul, och Daniel McKinley. Environmental Essays on the Planet as Home. Houghton-Mifflin, 1971.