Yocum, L. E. (1937). Visual outline of botany. Longmans, Green and Co..
Lua i Stíl Chicago (17ú heag.)Yocum, L. Edwin. Visual Outline of Botany. New York : Toronto: Longmans, Green and Co., 1937.
Lua MLA (8ú heag.)Yocum, L. Edwin. Visual Outline of Botany. Longmans, Green and Co., 1937.
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