Não informado. (1982). Fertilizers and agriculture. International Fertilizer Industry Association.
Lua i Stíl Chicago (17ú heag.)Não informado. Fertilizers and Agriculture. Paris: International Fertilizer Industry Association, 1982.
Lua MLA (8ú heag.)Não informado. Fertilizers and Agriculture. International Fertilizer Industry Association, 1982.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.