Allen, S. G., Mortenson, J., & Webb, S. (2011). Field guide to marine mammals of the Pacific Coast: Baja, California, Oregon, Washington, British Columbia. University of California Press.
Dyfyniad Arddull ChicagoAllen, Sarah G., Joseph Mortenson, and Sophie Webb. Field Guide to Marine Mammals of the Pacific Coast: Baja, California, Oregon, Washington, British Columbia. Berkeley: University of California Press, 2011.
Dyfyniad MLAAllen, Sarah G., et al. Field Guide to Marine Mammals of the Pacific Coast: Baja, California, Oregon, Washington, British Columbia. University of California Press, 2011.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.