APA (7th ed.) Citation

Powell, J. W., Porter, E., & Fowler, D. D. (1969). Down the Colorado: Diary of the first trip through the Grand Canyon, 1869. Promontory Press.

Chicago Style (17th ed.) Citation

Powell, John Wesley, Eliot Porter, and Don D. Fowler. Down the Colorado: Diary of the First Trip Through the Grand Canyon, 1869. [New York]: Promontory Press, 1969.

MLA (9th ed.) Citation

Powell, John Wesley, et al. Down the Colorado: Diary of the First Trip Through the Grand Canyon, 1869. Promontory Press, 1969.