Não informado. (1993). Journal of Agricultural and Applied Economics. Southern Agricultural Economics Association.
Lua i Stíl Chicago (17ú heag.)Não informado. Journal of Agricultural and Applied Economics. Auburn, Ala: Southern Agricultural Economics Association, 1993.
Lua MLA (8ú heag.)Não informado. Journal of Agricultural and Applied Economics. Southern Agricultural Economics Association, 1993.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.