Não informado. (1951). International Political Science Abstracts. International Political Science Association.
Lua i Stíl Chicago (17ú heag.)Não informado. International Political Science Abstracts. Paris: International Political Science Association, 1951.
Lua MLA (8ú heag.)Não informado. International Political Science Abstracts. International Political Science Association, 1951.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.