Agricultural History Society. (1927). Agricultural History. University of California Press.
Lua i Stíl Chicago (17ú heag.)Agricultural History Society. Agricultural History. Washington: University of California Press, 1927.
Lua MLA (8ú heag.)Agricultural History Society. Agricultural History. University of California Press, 1927.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.