Não informado. (1954). Agricultural Engineers Yearbook. American Society of Agricultural Engineers.
Lua i Stíl Chicago (17ú heag.)Não informado. Agricultural Engineers Yearbook. St. Joseph, Mich: American Society of Agricultural Engineers, 1954.
Lua MLA (8ú heag.)Não informado. Agricultural Engineers Yearbook. American Society of Agricultural Engineers, 1954.
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