Não informado. (1981). Modern Power Systems. United Trade Press.
Lua i Stíl Chicago (17ú heag.)Não informado. Modern Power Systems. London: United Trade Press, 1981.
Lua MLA (8ú heag.)Não informado. Modern Power Systems. United Trade Press, 1981.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.