Dyfyniad APA

American association of petroleum geologists. (1917). American association of petroleum geologists (AAPG) bulletin. American association of petroleum geologists, Inc.

Dyfyniad Arddull Chicago

American association of petroleum geologists. American Association of Petroleum Geologists (AAPG) Bulletin. Oklahoma: American association of petroleum geologists, Inc, 1917.

Dyfyniad MLA

American association of petroleum geologists. American Association of Petroleum Geologists (AAPG) Bulletin. American association of petroleum geologists, Inc, 1917.

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