Não informado. (1985). Better Crops International. Potash & Phosphate Institute.
Lua i Stíl Chicago (17ú heag.)Não informado. Better Crops International. Atlanta, Ga: Potash & Phosphate Institute, 1985.
Lua MLA (8ú heag.)Não informado. Better Crops International. Potash & Phosphate Institute, 1985.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.