APA (7th ed.) Citation

Van Dersal, W. R. (1942). Ornamental American shrubs. Oxford university press.

Chicago Style (17th ed.) Citation

Van Dersal, William Richard. Ornamental American Shrubs. New York, London: Oxford university press, 1942.

MLA (9th ed.) Citation

Van Dersal, William Richard. Ornamental American Shrubs. Oxford university press, 1942.