Não informado. (1937). Soils and Fertilizers: Abstracts of world literature. Commonwealth Agricultural Bureau.
Lua i Stíl Chicago (17ú heag.)Não informado. Soils and Fertilizers: Abstracts of World Literature. Farnham Royal, Inglaterra: Commonwealth Agricultural Bureau, 1937.
Lua MLA (8ú heag.)Não informado. Soils and Fertilizers: Abstracts of World Literature. Commonwealth Agricultural Bureau, 1937.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.