Gaya APA
Clesceri, L, S. (1998).
Standard Methods For The Examination of Water and Wastewater (20).
Maryland:
American Public Health Associaton.
Gaya MLA
Clesceri, Lenore, S..
"Standard Methods For The Examination of Water and Wastewater".
20
Maryland:
American Public Health Associaton,
1998.
Text.