Não informado. (1971). Euro abstracts. Commission of the European Communities.
Lua i Stíl Chicago (17ú heag.)Não informado. Euro Abstracts. Luxembourg: Commission of the European Communities, 1971.
Lua MLA (8ú heag.)Não informado. Euro Abstracts. Commission of the European Communities, 1971.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.