Dyfyniad APA

(1939). Vol. 17, № 19 (Vol. 31, № 38); Industrial and Engineering Chemistry. New Edition. 1939.

Dyfyniad Arddull Chicago

Vol. 17, № 19 (Vol. 31, № 38); Industrial and Engineering Chemistry. New Edition. 1939, 1939.

Dyfyniad MLA

Vol. 17, № 19 (Vol. 31, № 38); Industrial and Engineering Chemistry. New Edition. 1939, 1939.

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