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Dyfyniad Arddull ChicagoWilliams, Sidney. Official Methods of Analysis of the Association of Official Analytical Chemists. Washington: DC AOAC, 1984.
Dyfyniad MLAWilliams, Sidney. Official Methods of Analysis of the Association of Official Analytical Chemists. Washington: DC AOAC, 1984.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.