Dyfyniad APA

ENVIRONMENTAL PROGRESS. The American Institute of Chemicel Engineers.

Dyfyniad Arddull Chicago

ENVIRONMENTAL PROGRESS. New York: The American Institute of Chemicel Engineers.

Dyfyniad MLA

ENVIRONMENTAL PROGRESS. The American Institute of Chemicel Engineers.

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