Não informado. (1940). Soybean digest. American Soybean Association.
Lua i Stíl Chicago (17ú heag.)Não informado. Soybean Digest. Hudson, Iowa: American Soybean Association, 1940.
Lua MLA (8ú heag.)Não informado. Soybean Digest. American Soybean Association, 1940.
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