Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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