Mueller, T., Spring, B., Spring, I., & Mueller, M. (1968). Northwest ski trails ([1st ed.].). The Mountaineers.
Cita Chicago Style (17a ed.)Mueller, Ted, Bob Spring, Ira Spring, y Marge Mueller. Northwest Ski Trails. [1st ed.]. Seattle: The Mountaineers, 1968.
Cita MLA (8a ed.)Mueller, Ted, et al. Northwest Ski Trails. [1st ed.]. The Mountaineers, 1968.
Precaución: Estas citas no son 100% exactas.