Citazione APA

Iowa State College. Agricultural Extension Dept & Iowa State College. Agricultural Extension Dept. Schools Section. (1912). School circular. Dept. of Agricultural Extension, Schools Section.

Stile di citazione Chicago

Iowa State College. Agricultural Extension Dept e Iowa State College. Agricultural Extension Dept. Schools Section. School Circular. Ames, Iowa: Dept. of Agricultural Extension, Schools Section, 1912.

Citazione MLA

Iowa State College. Agricultural Extension Dept e Iowa State College. Agricultural Extension Dept. Schools Section. School Circular. Dept. of Agricultural Extension, Schools Section, 1912.