Helrich, K. (1984). Official methods of analysis of the Association of Official Analytical Chemists (14a. ed.). Association of Official Analytical Chemists.
Tohutoru Kātū Chicago (17th ed.)Helrich, Kenneth. Official Methods of Analysis of the Association of Official Analytical Chemists. 14a. ed. Arlington: Association of Official Analytical Chemists, 1984.
Tohutoro MLA (9th ed.)Helrich, Kenneth. Official Methods of Analysis of the Association of Official Analytical Chemists. 14a. ed. Association of Official Analytical Chemists, 1984.
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