APA-čujuhus (7. p.)
Kozlowska-Dawidziuk, A., & Lenz, A. (2004). Ludlow and Pridoli (Upper Silurian) Graptolites from the Arctic Islands, Canada. NRC Research Press.
Chicago-čujuhus (17. p.)
Kozlowska-Dawidziuk, Anna, juo Alfred Lenz. Ludlow and Pridoli (Upper Silurian) Graptolites from the Arctic Islands, Canada. Ottawa: NRC Research Press, 2004.
MLA-čujuhus (9. p.)
Kozlowska-Dawidziuk, Anna, juo Alfred Lenz. Ludlow and Pridoli (Upper Silurian) Graptolites from the Arctic Islands, Canada. NRC Research Press, 2004.
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