Gaya APA
Greenberg, M., J., T., A., E. (1971).
Standard Methods for The Examination of Water & Wastewater .
Geneva:
American Public Health Asociation.
Gaya MLA
Greenberg, M., J., T., A., E..
Standard Methods for The Examination of Water & Wastewater.
Geneva:
American Public Health Asociation,
1971.
Lawas.