Weber, W. A., & Wittmann, R. C. (2012). Colorado flora: A field guide to the vascular plants (4th ed.). University Press of Colorado.
芝加哥风格引文Weber, William A., 与 Ronald C. Wittmann. Colorado Flora: A Field Guide to the Vascular Plants. 4th ed. Boulder, Colo.: University Press of Colorado, 2012.
MLA引文Weber, William A., 与 Ronald C. Wittmann. Colorado Flora: A Field Guide to the Vascular Plants. 4th ed. University Press of Colorado, 2012.
警告：这些引文格式不一定是100％准确.