Harlow, W. M. (1959). Fruit key and twig key to trees and shrubs. Dover.
Citace podle Chicago (17th ed.)Harlow, William M. Fruit Key and Twig Key to Trees and Shrubs. New York, USA: Dover, 1959.
Citace podle MLA (9th ed.)Harlow, William M. Fruit Key and Twig Key to Trees and Shrubs. Dover, 1959.
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