Long, R. E. (1989). Energy and conservation. H.W. Wilson.
Cita Chicago (17th ed.)Long, Robert Emmet. Energy and Conservation. New York: H.W. Wilson, 1989.
Cita MLA (9th ed.)Long, Robert Emmet. Energy and Conservation. H.W. Wilson, 1989.
Atenció: Aquestes cites poden no estar 100% correctes.