Cita APA (7a ed.)

Weber, W. A., & Wittmann, R. C. (2011). Colorado Flora: Eastern Slope, Fourth Edition A Field Guide to the Vascular Plants (4th ed.). University Press of Colorado.

Cita Chicago Style (17a ed.)

Weber, William A., y Ronald C. Wittmann. Colorado Flora: Eastern Slope, Fourth Edition A Field Guide to the Vascular Plants. 4th ed. Boulder, Colo.: University Press of Colorado, 2011.

Cita MLA (8a ed.)

Weber, William A., y Ronald C. Wittmann. Colorado Flora: Eastern Slope, Fourth Edition A Field Guide to the Vascular Plants. 4th ed. University Press of Colorado, 2011.