Helrich, K. (1984). Official methods of analysis of the Association of Official Analytical Chemists (14a. ed.). Association of Official Analytical Chemists.
Citace podle 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.
Citace podle 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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