Não informado. (1937). Agricultural Education. American Vocational Association, Agricultural Section.
Lua i Stíl Chicago (17ú heag.)Não informado. Agricultural Education. Des Moines, Iowa: American Vocational Association, Agricultural Section, 1937.
Lua MLA (8ú heag.)Não informado. Agricultural Education. American Vocational Association, Agricultural Section, 1937.
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