Dyfyniad APA

Bernards, N. (1991). The Environmental crisis--opposing viewpoints. Greenhaven Press.

Dyfyniad Arddull Chicago

Bernards, Neal. The Environmental Crisis--opposing Viewpoints. San Diego, CA: Greenhaven Press, 1991.

Dyfyniad MLA

Bernards, Neal. The Environmental Crisis--opposing Viewpoints. Greenhaven Press, 1991.

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