Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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