Robertson, W. C. (2002). Energy. NSTA Press.
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Dyfyniad Arddull Chicago
Robertson, William C. Energy. Arlington, Va.: NSTA Press, 2002.
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Dyfyniad MLA
Robertson, William C. Energy. NSTA Press, 2002.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.