"ISO Standards 13.060: Water quality". International Organization for Standardization. Retrieved 2010-03-28. Includes toxicity, biodegradability, protection against pollution, related installations and equipment. Geneva, Switzerland.
Eaton, Andrew D.; Greenberg, Arnold E.; Rice, Eugene W.; Clesceri, Lenore S.; Franson, Mary Ann H., eds. (2005). Standard Methods For the Examination of Water and Wastewater (21 ed.). American Public Health Association. ISBN978-0-87553-047-5. Also available on CD-ROM and online by subscription.