Não informado. (1992). Journal of Agricultural and Resource Economics. Western Agricultural Economics Association.
Lua i Stíl Chicago (17ú heag.)Não informado. Journal of Agricultural and Resource Economics. Bozeman, Mont: Western Agricultural Economics Association, 1992.
Lua MLA (8ú heag.)Não informado. Journal of Agricultural and Resource Economics. Western Agricultural Economics Association, 1992.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.