Dyfyniad APA

(1999). Environmental management: Reading and cases. Boston: Houghton Mifflin.

Dyfyniad Arddull Chicago

Environmental Management: Reading and Cases. Boston: Houghton Mifflin, 1999.

Dyfyniad MLA

Environmental Management: Reading and Cases. Boston: Houghton Mifflin, 1999.

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