Cita APA

Wallace, R. 1., & Wallace, R. 1. (1972). The Grand Canyon ([1. edition].). New York, New York: The American Wilderness.

Citación estilo Chicago

Wallace, Robert 1919-, y Robert 1919- Wallace. The Grand Canyon. [1. edition]. New York, New York: The American Wilderness, 1972.

Cita MLA

Wallace, Robert 1919-, y Robert 1919- Wallace. The Grand Canyon. [1. edition]. New York, New York: The American Wilderness, 1972.