Dyfyniad APA

Cobban, W., & Kennedy, W. (1991). Some Upper Cretaceous ammonites from the Nacatoch Sand of Hempstead County, Arkansas.

Dyfyniad Arddull Chicago

Cobban, W., and W. Kennedy. Some Upper Cretaceous Ammonites from the Nacatoch Sand of Hempstead County, Arkansas. 1991.

Dyfyniad MLA

Cobban, W., and W. Kennedy. Some Upper Cretaceous Ammonites from the Nacatoch Sand of Hempstead County, Arkansas. 1991.

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