Cita APA (7th ed.)
ebrary, Inc, & Ludvigsen, R. (1996). Life in stone: A natural history of British Columbia's fossils. UBC Press.
Cita Chicago (17th ed.)
ebrary, Inc, i Rolf Ludvigsen. Life in Stone: A Natural History of British Columbia's Fossils. Vancouver, BC: UBC Press, 1996.
Cita MLA (9th ed.)
ebrary, Inc, i Rolf Ludvigsen. Life in Stone: A Natural History of British Columbia's Fossils. UBC Press, 1996.
Atenció: Aquestes cites poden no estar 100% correctes.