Não informado. (1987). The Journal of Agricultural Economics Research. U.S. Department of Agriculture.
Lua i Stíl Chicago (17ú heag.)Não informado. The Journal of Agricultural Economics Research. Washington: U.S. Department of Agriculture, 1987.
Lua MLA (8ú heag.)Não informado. The Journal of Agricultural Economics Research. U.S. Department of Agriculture, 1987.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.