Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.