Não informado. (1975). Energy. Business Communications.
Lua i Stíl Chicago (17ú heag.)Não informado. Energy. Stanford, Conn: Business Communications, 1975.
Lua MLA (8ú heag.)Não informado. Energy. Business Communications, 1975.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.