Cita APA (7a ed.)

Helrich, K. (1990). Official methods of analysis of the Association of Official Analytical Chemists.: V.2 (15th edition.). AOAC.

Cita Chicago Style (17a ed.)

Helrich, Kenneth. Official Methods of Analysis of the Association of Official Analytical Chemists.: V.2. 15th edition. Washington, DC: AOAC, 1990.

Cita MLA (8a ed.)

Helrich, Kenneth. Official Methods of Analysis of the Association of Official Analytical Chemists.: V.2. 15th edition. AOAC, 1990.