Não informado. (1972). Alternative sources of energy. Alternative Sources of Energy.
Style de citation Chicago (17e éd.)Não informado. Alternative Sources of Energy. Milaca, Minn: Alternative Sources of Energy, 1972.
Style de citation MLA (8e éd.)Não informado. Alternative Sources of Energy. Alternative Sources of Energy, 1972.
Attention : ces citations peuvent ne pas être correctes à 100%.