Dyfyniad APA

Nelson, W. L. (1949). Petroleum refinery engineering. New York : McGraw-Hill.

Dyfyniad Arddull Chicago

Nelson, Wilbur Lundine. Petroleum Refinery Engineering. New York : McGraw-Hill, 1949.

Dyfyniad MLA

Nelson, Wilbur Lundine. Petroleum Refinery Engineering. New York : McGraw-Hill, 1949.

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