Não informado. (1968). Government Reports Index. U.S. Department of Commerce, National Technical Information Service.
Lua i Stíl Chicago (17ú heag.)Não informado. Government Reports Index. Washington: U.S. Department of Commerce, National Technical Information Service, 1968.
Lua MLA (8ú heag.)Não informado. Government Reports Index. U.S. Department of Commerce, National Technical Information Service, 1968.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.