APA (7e ed.) Bronvermelding

Não informado. (1972). Alternative sources of energy. Alternative Sources of Energy.

Chicago (17e ed.) Bronvermelding

Não informado. Alternative Sources of Energy. Milaca, Minn: Alternative Sources of Energy, 1972.

MLA (8e ed.) Bronvermelding

Não informado. Alternative Sources of Energy. Alternative Sources of Energy, 1972.

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