Gillespie, R. J. (1989). Chemistry (2nd ed.). Allyn and Bacon.
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Dyfyniad Arddull Chicago
Gillespie, Ronald J. Chemistry. 2nd ed. Boston: Allyn and Bacon, 1989.
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Dyfyniad MLA
Gillespie, Ronald J. Chemistry. 2nd ed. Allyn and Bacon, 1989.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.