Não informado. Iowa State College bulletin. Iowa State College of Agriculture and Mechanic Arts.
Lua i Stíl Chicago (17ú heag.)Não informado. Iowa State College Bulletin. Ames, Iowa: Iowa State College of Agriculture and Mechanic Arts.
Lua MLA (8ú heag.)Não informado. Iowa State College Bulletin. Iowa State College of Agriculture and Mechanic Arts.
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