Association of Official Analytical Chemists., editor, & Helrich, K. (1990). Official methods of analysis of the Association of Official Analytical Chemists: 1, Agricultural chemicals, contaminants, drugs (15th ed.). Association of Official Analytical Chemists.
Cita Chicago Style (17a ed.)Association of Official Analytical Chemists., editor, y Kenneth Helrich. Official Methods of Analysis of the Association of Official Analytical Chemists: 1, Agricultural Chemicals, Contaminants, Drugs. 15th ed. Arlington: Association of Official Analytical Chemists, 1990.
Cita MLA (9a ed.)Association of Official Analytical Chemists., editor, y Kenneth Helrich. Official Methods of Analysis of the Association of Official Analytical Chemists: 1, Agricultural Chemicals, Contaminants, Drugs. 15th ed. Association of Official Analytical Chemists, 1990.
