APA
Harlow W. M., . (1946). Fruit key and twig key to trees and shrubs. New York: Dover Publications.
Chicago
Harlow William M, . 1946. Fruit key and twig key to trees and shrubs. New York: Dover Publications.
Harvard
Harlow W. M., . (1946). Fruit key and twig key to trees and shrubs. New York: Dover Publications.
MLA
Harlow William M, . Fruit key and twig key to trees and shrubs. New York: Dover Publications. 1946.