APA (7th ed.) Zitazioa
Kozlowska-Dawidziuk, A., & Lenz, A. (2004). Ludlow and Pridoli (Upper Silurian) Graptolites from the Arctic Islands, Canada. NRC Research Press.
Chicago Style (17th ed.) Zitazioa
Kozlowska-Dawidziuk, Anna, eta Alfred Lenz. Ludlow and Pridoli (Upper Silurian) Graptolites from the Arctic Islands, Canada. Ottawa: NRC Research Press, 2004.
MLA (9th ed.) Zitazioa
Kozlowska-Dawidziuk, Anna, eta Alfred Lenz. Ludlow and Pridoli (Upper Silurian) Graptolites from the Arctic Islands, Canada. NRC Research Press, 2004.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.