Cita APA (7a ed.)
Bahn, P. G., & Vertut, J. (1997). Journey through the ice age. University of California.
Cita Chicago Style (17a ed.)
Bahn, Paul G., y Jean Vertut. Journey Through the Ice Age. Berkeley: University of California, 1997.
Cita MLA (9a ed.)
Bahn, Paul G., y Jean Vertut. Journey Through the Ice Age. University of California, 1997.
Precaución: Estas citas no son 100% exactas.