Cita APA (7th ed.)

Palaeontological Association, Swift, A., & Martill, D. M. (1999). Fossils of the Rhaetian Penarth group. Paleontological Association.

Cita Chicago (17th ed.)

Palaeontological Association, Andrew Swift, i David M. Martill. Fossils of the Rhaetian Penarth Group. London: Paleontological Association, 1999.

Cita MLA (8th ed.)

Palaeontological Association, et al. Fossils of the Rhaetian Penarth Group. Paleontological Association, 1999.