Não informado. (1959). World agricultural economics and rural sociology abstracts. Commonwealth Agricultural Bureau.
Lua i Stíl Chicago (17ú heag.)Não informado. World Agricultural Economics and Rural Sociology Abstracts. Farnham Royal, Inglaterra: Commonwealth Agricultural Bureau, 1959.
Lua MLA (8ú heag.)Não informado. World Agricultural Economics and Rural Sociology Abstracts. Commonwealth Agricultural Bureau, 1959.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.