Dyfyniad APA

Society of Economic Geologists. (1925). Economic Geology Vol.20 Nos.1-8.

Dyfyniad Arddull Chicago

Society of Economic Geologists. Economic Geology Vol.20 Nos.1-8. Economic Geology Publishing Co, 1925.

Dyfyniad MLA

Society of Economic Geologists. Economic Geology Vol.20 Nos.1-8. 1925.

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