Gaya APA
Baird, R. (2017).
Standar Methods for the Examination of Water and Wastewater (23rd edition).
Washington DC:
Apha.
Gaya MLA
Baird, Rodger.
"Standar Methods for the Examination of Water and Wastewater".
23rd edition
Washington DC:
Apha,
2017.
Text.