Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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