APA (7th ed.) Citation

Orr, R. T. (1974). Wild flowers of Western America. Alfred A. Knop.

Chicago Style (17th ed.) Citation

Orr, Robert T. Wild Flowers of Western America. New York: Alfred A. Knop, 1974.

MLA (9th ed.) Citation

Orr, Robert T. Wild Flowers of Western America. Alfred A. Knop, 1974.