Cita APA (7a ed.)

Copper, P. (2004). Silurian (late Llandovery-Ludlow) atrypid brachiopods from Gotland, Sweden, and the Welsh Borderlands, Great Britain. NRC Research Press.

Cita Chicago Style (17a ed.)

Copper, Paul. Silurian (late Llandovery-Ludlow) Atrypid Brachiopods from Gotland, Sweden, and the Welsh Borderlands, Great Britain. Ottawa, Ontario, Canada: NRC Research Press, 2004.

Cita MLA (8a ed.)

Copper, Paul. Silurian (late Llandovery-Ludlow) Atrypid Brachiopods from Gotland, Sweden, and the Welsh Borderlands, Great Britain. NRC Research Press, 2004.