Dyfyniad APA

Petterson, H. (1969). Ocean floor. Hafner publishing company.

Dyfyniad Arddull Chicago

Petterson, Hans. Ocean Floor. London: Hafner publishing company, 1969.

Dyfyniad MLA

Petterson, Hans. Ocean Floor. Hafner publishing company, 1969.

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