Copper, P. (2004). Silurian (late Llandovery-Ludlow) atrypid brachiopods from Gotland, Sweden and the Welsh Borderlands, Great Britain. NRC Research Press.
Chicago-Zitierstil (17. Ausg.)Copper, Paul. Silurian (late Llandovery-Ludlow) Atrypid Brachiopods from Gotland, Sweden and the Welsh Borderlands, Great Britain. Ottawa: NRC Research Press, 2004.
MLA-Zitierstil (9. Ausg.)Copper, Paul. Silurian (late Llandovery-Ludlow) Atrypid Brachiopods from Gotland, Sweden and the Welsh Borderlands, Great Britain. NRC Research Press, 2004.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.