Não informado. (1951). Annual Report of the International Tin Research Council. International Tin Research Institute.
Lua i Stíl Chicago (17ú heag.)Não informado. Annual Report of the International Tin Research Council. Greenford, Inglaterra: International Tin Research Institute, 1951.
Lua MLA (8ú heag.)Não informado. Annual Report of the International Tin Research Council. International Tin Research Institute, 1951.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.