Cita APA (7a ed.)

Kennedy, W., Landman, N., Cobban, W., & Scott, G. (2000). Late campanian (cretaceous) heteromorph ammonites from the western interior of the United States.

Cita Chicago Style (17a ed.)

Kennedy, W., N. Landman, W. Cobban, y G. Scott. Late Campanian (cretaceous) Heteromorph Ammonites from the Western Interior of the United States. 2000.

Cita MLA (9a ed.)

Kennedy, W., et al. Late Campanian (cretaceous) Heteromorph Ammonites from the Western Interior of the United States. 2000.