Gray, H. E. (1955). Farm service buildings. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Gray, Harold E. Farm Service Buildings. New York: McGraw-Hill, 1955.
Lua MLA (9ú heag.)Gray, Harold E. Farm Service Buildings. McGraw-Hill, 1955.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.