Iowa State College. Extension Service. (1934). Extension circular. Iowa State College of Agriculture and Mechanic Arts.
Lua i Stíl Chicago (17ú heag.)Iowa State College. Extension Service. Extension Circular. Ames, Iowa: Iowa State College of Agriculture and Mechanic Arts, 1934.
Lua MLA (8ú heag.)Iowa State College. Extension Service. Extension Circular. Iowa State College of Agriculture and Mechanic Arts, 1934.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.