APA (7th ed.) Citation

Perry, J., & Perry, J. G. (1985). The Sierra Club guide to the natural areas of Colorado and Utah. Sierra Club Books.

Chicago Style (17th ed.) Citation

Perry, John, and Jane Greverus Perry. The Sierra Club Guide to the Natural Areas of Colorado and Utah. San Francisco: Sierra Club Books, 1985.

MLA (9th ed.) Citation

Perry, John, and Jane Greverus Perry. The Sierra Club Guide to the Natural Areas of Colorado and Utah. Sierra Club Books, 1985.