Não informado. (1973). Asher's guide to botanical periodicals. Asher.
Lua i Stíl Chicago (17ú heag.)Não informado. Asher's Guide to Botanical Periodicals. Amsterdam: Asher, 1973.
Lua MLA (8ú heag.)Não informado. Asher's Guide to Botanical Periodicals. Asher, 1973.
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