Não informado. (1976). Erda energy research abstracts. Energy Research and Development Administration.
Lua i Stíl Chicago (17ú heag.)Não informado. Erda Energy Research Abstracts. Washington: Energy Research and Development Administration, 1976.
Lua MLA (8ú heag.)Não informado. Erda Energy Research Abstracts. Energy Research and Development Administration, 1976.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.