Dyfyniad APA

HAGER, D. Pratical oil geology. McGraw Hill Book Company Inc.

Dyfyniad Arddull Chicago

HAGER, Dorsey. Pratical Oil Geology. McGraw Hill Book Company Inc.

Dyfyniad MLA

HAGER, Dorsey. Pratical Oil Geology. McGraw Hill Book Company Inc.

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