Lua APA (7ú heag.)
Kozlowska-Dawidziuk, A., & Lenz, A. (2004). Ludlow and Pridoli (Upper Silurian) Graptolites from the Arctic Islands, Canada. NRC Research Press.
Lua i Stíl Chicago (17ú heag.)
Kozlowska-Dawidziuk, Anna, agus Alfred Lenz. Ludlow and Pridoli (Upper Silurian) Graptolites from the Arctic Islands, Canada. Ottawa: NRC Research Press, 2004.
Lua MLA (9ú heag.)
Kozlowska-Dawidziuk, Anna, agus Alfred Lenz. Ludlow and Pridoli (Upper Silurian) Graptolites from the Arctic Islands, Canada. NRC Research Press, 2004.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.