Não informado. (2004). Oxford Agrarian Studies. University of Oxford, Institute of Agricultural Economics.
Lua i Stíl Chicago (17ú heag.)Não informado. Oxford Agrarian Studies. Oxford, Inglaterra: University of Oxford, Institute of Agricultural Economics, 2004.
Lua MLA (8ú heag.)Não informado. Oxford Agrarian Studies. University of Oxford, Institute of Agricultural Economics, 2004.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.