APA (7th ed.) Citation

Association of Official Analytical Chemists. & Helrich, K. (1990). Official methods of analysis of the Association of Official Analytical Chemists (15th ed.). Association of Official Analytical Chemists.

Chicago Style (17th ed.) Citation

Association of Official Analytical Chemists. and Kenneth Helrich. Official Methods of Analysis of the Association of Official Analytical Chemists. 15th ed. Arlington (Va.): Association of Official Analytical Chemists, 1990.

MLA (9th ed.) Citation

Association of Official Analytical Chemists. and Kenneth Helrich. Official Methods of Analysis of the Association of Official Analytical Chemists. 15th ed. Association of Official Analytical Chemists, 1990.