Não informado. (1976). Erda energy research abstracts. Energy Research and Development Administration.
Chicago-Zitierstil (17. Ausg.)Não informado. Erda Energy Research Abstracts. Washington: Energy Research and Development Administration, 1976.
MLA-Zitierstil (8. Ausg.)Não informado. Erda Energy Research Abstracts. Energy Research and Development Administration, 1976.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.