Dyfyniad APA

Paul, P., & Wise, W. S. (1971). Principles of gas extraction. Mills and Boon.

Dyfyniad Arddull Chicago

Paul, P.F.M, and W. S. Wise. Principles of Gas Extraction. London: Mills and Boon, 1971.

Dyfyniad MLA

Paul, P.F.M, and W. S. Wise. Principles of Gas Extraction. Mills and Boon, 1971.

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