NELSON, A. (1949). Introductory botany. E&S Livingstone.
Lua i Stíl Chicago (17ú heag.)NELSON, Alexander. Introductory Botany. E&S Livingstone, 1949.
Lua MLA (8ú heag.)NELSON, Alexander. Introductory Botany. E&S Livingstone, 1949.
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