APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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