APA (7e ed.) Bronvermelding

Não informado. (1976). Erda energy research abstracts. Energy Research and Development Administration.

Chicago (17e ed.) Bronvermelding

Não informado. Erda Energy Research Abstracts. Washington: Energy Research and Development Administration, 1976.

MLA (8e ed.) Bronvermelding

Não informado. Erda Energy Research Abstracts. Energy Research and Development Administration, 1976.

Let op: Deze citaties zijn niet altijd 100% accuraat.