Harlow, W. M. (1941). Fruit key and twig key to trees and shrubs : fruit key to Northeastern trees: Fruit key to Northeastern trees. Dover Publications.
Chicago Style (17th ed.) CitationHarlow, William Morehouse. Fruit Key and Twig Key to Trees and Shrubs : Fruit Key to Northeastern Trees: Fruit Key to Northeastern Trees. New York: Dover Publications, 1941.
MLA (9th ed.) CitationHarlow, William Morehouse. Fruit Key and Twig Key to Trees and Shrubs : Fruit Key to Northeastern Trees: Fruit Key to Northeastern Trees. Dover Publications, 1941.
Warning: These citations may not always be 100% accurate.