Gaya APA
Tchobanoglous, G. et al (1998).
Small and Decentralized Wastewater Management Systems .
SINGAPORE:
McGRAW- ill International Editions.
Gaya MLA
Tchobanoglous, George. et al.
"Small and Decentralized Wastewater Management Systems".
SINGAPORE:
McGRAW- ill International Editions,
1998.
Text.