Não informado. (1942). Plant science literature. U.S. Department of Agriculture, Bureau of Plant Industry.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Plant Science Literature. Washington: U.S. Department of Agriculture, Bureau of Plant Industry, 1942.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Plant Science Literature. U.S. Department of Agriculture, Bureau of Plant Industry, 1942.
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