APA (7th ed.) Citation

Heiniger, E. A., & Krutch, J. W. (1975). Grand Canyon. R. B. Luce Co..

Chicago Style (17th ed.) Citation

Heiniger, Ernst A., and Joseph Wood Krutch. Grand Canyon. Washington: R. B. Luce Co., 1975.

MLA (8th ed.) Citation

Heiniger, Ernst A., and Joseph Wood Krutch. Grand Canyon. R. B. Luce Co., 1975.