Gaya APA
Greenberg, A., F. et al. (1995).
Standard Methods for the examination of water and wastewater (19 nd ed).
New York:
Aemerican Public Health Association.
Gaya MLA
Greenberg, A., F. et al..
Standard Methods for the examination of water and wastewater.
19 nd ed
New York:
Aemerican Public Health Association,
1995.
Text.