APA (7th ed.) Zitazioa

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

Chicago Style (17th ed.) Zitazioa

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

MLA (9th ed.) Zitazioa

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