CROCKETT, J. U. (1977). Flowering Shrubs James Underwood Crockett. Time Life Books.
Lua i Stíl Chicago (17ú heag.)CROCKETT, James Underwood. Flowering Shrubs James Underwood Crockett. Time Life Books, 1977.
Lua MLA (8ú heag.)CROCKETT, James Underwood. Flowering Shrubs James Underwood Crockett. Time Life Books, 1977.
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