Não informado. (1972). Alternative sources of energy. Alternative Sources of Energy.
Lua i Stíl Chicago (17ú heag.)Não informado. Alternative Sources of Energy. Milaca, Minn: Alternative Sources of Energy, 1972.
Lua MLA (8ú heag.)Não informado. Alternative Sources of Energy. Alternative Sources of Energy, 1972.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.