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MLA

Shull James Marion 1872-1948. "Malus Domestica: Esopus Spitzenberg." ,

APA

Shull James Marion 1872-1948, S. James Marion 1872-1948. (0000). Malus domestica: Esopus Spitzenberg.

Chicago

Shull James Marion 1872-1948 "Malus domestica: Esopus Spitzenberg" (1936):