Não informado. (1931). American Fruit Grower. American Fruit Grower Publishing.
Chicago-referens (17:e uppl.)Não informado. American Fruit Grower. Willoughby, Ohio: American Fruit Grower Publishing, 1931.
MLA-referens (8:e uppl.)Não informado. American Fruit Grower. American Fruit Grower Publishing, 1931.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.