APA (7th ed.) Citation

Cronquist, A. (1981). An integrated system of classification of flowering plants. Columbia University Press.

Chicago Style (17th ed.) Citation

Cronquist, Arthur. An Integrated System of Classification of Flowering Plants. New York: Columbia University Press, 1981.

MLA (8th ed.) Citation

Cronquist, Arthur. An Integrated System of Classification of Flowering Plants. Columbia University Press, 1981.