Não informado. (1980). Enhanced Energy Recovery News. Business Communications.
Lua i Stíl Chicago (17ú heag.)Não informado. Enhanced Energy Recovery News. Houston, Tex: Business Communications, 1980.
Lua MLA (8ú heag.)Não informado. Enhanced Energy Recovery News. Business Communications, 1980.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.