APA (7th ed.) Citation

Weber, W. A., & Wittmann, R. C. (1996). Colorado flora (Rev. ed.). University Press of Colorado.

Chicago Style (17th ed.) Citation

Weber, William A., and Ronald C. Wittmann. Colorado Flora. Rev. ed. Boulder: University Press of Colorado, 1996.

MLA (9th ed.) Citation

Weber, William A., and Ronald C. Wittmann. Colorado Flora. Rev. ed. University Press of Colorado, 1996.