Weber, W. A. (1976). Rocky Mountain flora: A field guide for the identification of the ferns, conifers, and flowering plants of the southern Rocky Mountains from Pikes Peak to Rocky Mountain National Park and from the plains to the Continental Divide (5th ed., rev.). Colorado Associated University Press.
Chicago Style (17th ed.) CitationWeber, William A. Rocky Mountain Flora: A Field Guide for the Identification of the Ferns, Conifers, and Flowering Plants of the Southern Rocky Mountains from Pikes Peak to Rocky Mountain National Park and from the Plains to the Continental Divide. 5th ed., rev. Boulder: Colorado Associated University Press, 1976.
MLA (9th ed.) CitationWeber, William A. Rocky Mountain Flora: A Field Guide for the Identification of the Ferns, Conifers, and Flowering Plants of the Southern Rocky Mountains from Pikes Peak to Rocky Mountain National Park and from the Plains to the Continental Divide. 5th ed., rev. Colorado Associated University Press, 1976.