APA (7th ed.) Citation

STANDARD. (1998). Standard methods for the examination of water and wastewater.-- ed.20. APHA.

Chicago Style (17th ed.) Citation

STANDARD. Standard Methods for the Examination of Water and Wastewater.-- Ed.20. Maryland: APHA, 1998.

MLA (9th ed.) Citation

STANDARD. Standard Methods for the Examination of Water and Wastewater.-- Ed.20. APHA, 1998.