APA (7th ed.) Citation

Usher, G. (1974). A dictionary of plants used by man. Hafner Press.

Chicago Style (17th ed.) Citation

Usher, George. A Dictionary of Plants Used by Man. New York: Hafner Press, 1974.

MLA (8th ed.) Citation

Usher, George. A Dictionary of Plants Used by Man. Hafner Press, 1974.