Iowa State College. Extension Service. Iowa 4-H leader. Iowa State College, Extension Service.
Chicago-referens (17:e uppl.)Iowa State College. Extension Service. Iowa 4-H Leader. Ames: Iowa State College, Extension Service.
MLA-referens (8:e uppl.)Iowa State College. Extension Service. Iowa 4-H Leader. Iowa State College, Extension Service.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.