Dyfyniad APA

.Parker, S. P. (1981). Encyclopedia of Energy (second edition.). McGraw-Hill.

Dyfyniad Arddull Chicago

.Parker, Sybil P. Encyclopedia of Energy. second edition. New York: McGraw-Hill, 1981.

Dyfyniad MLA

.Parker, Sybil P. Encyclopedia of Energy. second edition. McGraw-Hill, 1981.

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