Dyfyniad APA

(1996). Environmental engineering world. McGraw-Hill Companies, Inc.

Dyfyniad Arddull Chicago

Environmental Engineering World. New York: McGraw-Hill Companies, Inc, 1996.

Dyfyniad MLA

Environmental Engineering World. McGraw-Hill Companies, Inc, 1996.

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