APA-viite (7. p.)
Potter, A. (1986). Ordovician sphinctozoan Sponges from the eastern Klamath Mountains, northern California.
Chicago-viite (17. p.)
Potter, A.W. Ordovician Sphinctozoan Sponges from the Eastern Klamath Mountains, Northern California. 1986.
MLA-viite (9. p.)
Potter, A.W. Ordovician Sphinctozoan Sponges from the Eastern Klamath Mountains, Northern California. 1986.
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