Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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