Não informado. (1981). Test & measurement world. Cahners Publishing.
Lua i Stíl Chicago (17ú heag.)Não informado. Test & Measurement World. Newton, Mass: Cahners Publishing, 1981.
Lua MLA (8ú heag.)Não informado. Test & Measurement World. Cahners Publishing, 1981.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.