APA (7th ed.) Zitazioa
ebrary, Inc, & Ludvigsen, R. (1996). Life in stone: A natural history of British Columbia's fossils. UBC Press.
Chicago Style (17th ed.) Zitazioa
ebrary, Inc, eta Rolf Ludvigsen. Life in Stone: A Natural History of British Columbia's Fossils. Vancouver, BC: UBC Press, 1996.
MLA (9th ed.) Zitazioa
ebrary, Inc, eta Rolf Ludvigsen. Life in Stone: A Natural History of British Columbia's Fossils. UBC Press, 1996.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.