Não informado. (1976). Erda energy research abstracts. Energy Research and Development Administration.
Cita Chicago Style (17a ed.)Não informado. Erda Energy Research Abstracts. Washington: Energy Research and Development Administration, 1976.
Cita MLA (8a ed.)Não informado. Erda Energy Research Abstracts. Energy Research and Development Administration, 1976.
Precaución: Estas citas no son 100% exactas.