.Parker, S. P. (1981). Encyclopedia of Energy (second edition.). McGraw-Hill.
Cita Chicago (17th ed.).Parker, Sybil P. Encyclopedia of Energy. second edition. New York: McGraw-Hill, 1981.
Cita MLA (9th ed.).Parker, Sybil P. Encyclopedia of Energy. second edition. McGraw-Hill, 1981.
Atenció: Aquestes cites poden no estar 100% correctes.