Não informado. (1976). Erda energy research abstracts. Energy Research and Development Administration.
Style de citation Chicago (17e éd.)Não informado. Erda Energy Research Abstracts. Washington: Energy Research and Development Administration, 1976.
Style de citation MLA (8e éd.)Não informado. Erda Energy Research Abstracts. Energy Research and Development Administration, 1976.
Attention : ces citations peuvent ne pas être correctes à 100%.