Dyfyniad APA

Nelson, W. (1949). Petroleum Refinery Engineering (4th ed.). McGraw-Hill.

Dyfyniad Arddull Chicago

Nelson, W.L. Petroleum Refinery Engineering. 4th ed. Tokyo: McGraw-Hill, 1949.

Dyfyniad MLA

Nelson, W.L. Petroleum Refinery Engineering. 4th ed. McGraw-Hill, 1949.

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