Tukey, H. B. (1928). The pear and its culture: Designed for both the amateur and the commercial grower. Orange Judd Publishing.
Chicago-referens (17:e uppl.)Tukey, H. B. The Pear and Its Culture: Designed for Both the Amateur and the Commercial Grower. New York: Orange Judd Publishing, 1928.
MLA-referens (9:e uppl.)Tukey, H. B. The Pear and Its Culture: Designed for Both the Amateur and the Commercial Grower. Orange Judd Publishing, 1928.
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