APA (7th ed.) Citation

Johnston, B. C. (1987). Plant associations of region two: Potential plant communities of Wyoming, South Dakota, Nebraska, Colorado, and Kansas (Ed. 4.). USDA Forest Service, Rocky Mountain Region.

Chicago Style (17th ed.) Citation

Johnston, Barry C. Plant Associations of Region Two: Potential Plant Communities of Wyoming, South Dakota, Nebraska, Colorado, and Kansas. Ed. 4. Lakewood, Colo.: USDA Forest Service, Rocky Mountain Region, 1987.

MLA (9th ed.) Citation

Johnston, Barry C. Plant Associations of Region Two: Potential Plant Communities of Wyoming, South Dakota, Nebraska, Colorado, and Kansas. Ed. 4. USDA Forest Service, Rocky Mountain Region, 1987.