Gaya APA

Greenberg, A., F. et al. (1979). Standard Methods for the examination of water and wastewater (7 nd ed). New York: Aemerican Public Health Association.

Gaya MLA

Greenberg, A., F. et al.. Standard Methods for the examination of water and wastewater. 7 nd ed New York: Aemerican Public Health Association, 1979. Text.