Não informado. (1973). Energy index. Environment Information Center, Energy Reference Department.
Style de citation Chicago (17e éd.)Não informado. Energy Index. New York: Environment Information Center, Energy Reference Department, 1973.
Style de citation MLA (8e éd.)Não informado. Energy Index. Environment Information Center, Energy Reference Department, 1973.
Attention : ces citations peuvent ne pas être correctes à 100%.