Não informado. (1974). Monthly Energy Review. U.S. Energy Information Administration.
Lua i Stíl Chicago (17ú heag.)Não informado. Monthly Energy Review. Washington: U.S. Energy Information Administration, 1974.
Lua MLA (8ú heag.)Não informado. Monthly Energy Review. U.S. Energy Information Administration, 1974.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.