Alt, D. D., & Hyndman, D. W. (1972). Roadside geology of the northern Rockies. Mountain Press Pub. Co.
Cita Chicago Style (17a ed.)Alt, David D., y Donald W. Hyndman. Roadside Geology of the Northern Rockies. Missoula, Mont.: Mountain Press Pub. Co, 1972.
Cita MLA (8a ed.)Alt, David D., y Donald W. Hyndman. Roadside Geology of the Northern Rockies. Mountain Press Pub. Co, 1972.
Precaución: Estas citas no son 100% exactas.