Dyfyniad APA

Spencer, E. W. (1962). Basic concepts of historical geology. Oxford & IBH.

Dyfyniad Arddull Chicago

Spencer, Edgar Winston. Basic Concepts of Historical Geology. New Delhi: Oxford & IBH, 1962.

Dyfyniad MLA

Spencer, Edgar Winston. Basic Concepts of Historical Geology. Oxford & IBH, 1962.

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