Não informado. (1951). Fertilizers. Food and Agriculture Organization of the United Nations.
Lua i Stíl Chicago (17ú heag.)Não informado. Fertilizers. Rome: Food and Agriculture Organization of the United Nations, 1951.
Lua MLA (8ú heag.)Não informado. Fertilizers. Food and Agriculture Organization of the United Nations, 1951.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.