Cita APA (7a ed.)

ebrary, Inc, & Ludvigsen, R. (1996). Life in stone: A natural history of British Columbia's fossils. UBC Press.

Cita Chicago Style (17a ed.)

ebrary, Inc, y Rolf Ludvigsen. Life in Stone: A Natural History of British Columbia's Fossils. Vancouver, BC: UBC Press, 1996.

Cita MLA (9a ed.)

ebrary, Inc, y Rolf Ludvigsen. Life in Stone: A Natural History of British Columbia's Fossils. UBC Press, 1996.