Dyfyniad APA

(1990). Official Methods Of Analysis Association Of Analytical Chemists ed. Kenneth Helrich. AOAC.

Dyfyniad Arddull Chicago

Official Methods Of Analysis Association Of Analytical Chemists Ed. Kenneth Helrich. AOAC, 1990.

Dyfyniad MLA

Official Methods Of Analysis Association Of Analytical Chemists Ed. Kenneth Helrich. AOAC, 1990.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.