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.