एपीए उद्धरण

Dupree, W. G. (1972). United States Energy Through the Year 2000. Washington: U.S. Department of teh Interior.

शिकागो स्टाइल उद्धरण

Dupree, Walter G. United States Energy Through the Year 2000. Washington: U.S. Department of teh Interior, 1972.

एमएलए उद्धरण

Dupree, Walter G. United States Energy Through the Year 2000. Washington: U.S. Department of teh Interior, 1972.