APA (7th ed.) Citation

Weber, W. A., & Wittmann, R. C. (2001). Colorado Flora: Eastern slope (3rd ed.). University Press of Colorado.

Chicago Style (17th ed.) Citation

Weber, William A., and Ronald C. Wittmann. Colorado Flora: Eastern Slope. 3rd ed. Boulder: University Press of Colorado, 2001.

MLA (9th ed.) Citation

Weber, William A., and Ronald C. Wittmann. Colorado Flora: Eastern Slope. 3rd ed. University Press of Colorado, 2001.