Robertson, W. C. (2006). Math. NSTA Press.
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Dyfyniad Arddull Chicago
Robertson, William C. Math. Arlington, Va.: NSTA Press, 2006.
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Dyfyniad MLA
Robertson, William C. Math. NSTA Press, 2006.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.