APA (7th ed.) Citation

Harlow, W. M. (1959). Fruit key and twig key to trees and shrubs. Dover.

Chicago Style (17th ed.) Citation

Harlow, William M. Fruit Key and Twig Key to Trees and Shrubs. New York, USA: Dover, 1959.

MLA (9th ed.) Citation

Harlow, William M. Fruit Key and Twig Key to Trees and Shrubs. Dover, 1959.