Iowa State College. Agricultural Extension Dept & Iowa State College. Agricultural Extension Dept. Schools Section. (1912). School circular. Dept. of Agricultural Extension, Schools Section.
Lua i Stíl Chicago (17ú heag.)Iowa State College. Agricultural Extension Dept agus Iowa State College. Agricultural Extension Dept. Schools Section. School Circular. Ames, Iowa: Dept. of Agricultural Extension, Schools Section, 1912.
Lua MLA (8ú heag.)Iowa State College. Agricultural Extension Dept agus Iowa State College. Agricultural Extension Dept. Schools Section. School Circular. Dept. of Agricultural Extension, Schools Section, 1912.
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