American Public Health Association, United States. Environmental Protection Agency, American Water Works Association, Water Pollution Control Federation, & American Public Health Association. (1981). Supplement to the fifteenth edition of Standard methods for the examination of water and wastewater: Selected analytical methods approved and cited by the United States Environmental Protection Agency. APHA-AWWA-WPCF.
Cita Chicago (17th ed.)American Public Health Association, United States. Environmental Protection Agency, American Water Works Association, Water Pollution Control Federation, i American Public Health Association. Supplement to the Fifteenth Edition of Standard Methods for the Examination of Water and Wastewater: Selected Analytical Methods Approved and Cited by the United States Environmental Protection Agency. [Washington, D.C.]: APHA-AWWA-WPCF, 1981.
Cita MLA (8th ed.)American Public Health Association, et al. Supplement to the Fifteenth Edition of Standard Methods for the Examination of Water and Wastewater: Selected Analytical Methods Approved and Cited by the United States Environmental Protection Agency. APHA-AWWA-WPCF, 1981.