Não informado. (1952). World agriculture. International Federation of Agricultural Producers.
Lua i Stíl Chicago (17ú heag.)Não informado. World Agriculture. Paris: International Federation of Agricultural Producers, 1952.
Lua MLA (8ú heag.)Não informado. World Agriculture. International Federation of Agricultural Producers, 1952.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.