Gaya APA
Ray, C., Jain, R. (2014).
Low cost emergency water purification technologies .
Waltham, MA:
Butterworth-Heinemann.
Gaya MLA
Ray, Chittaranjan., Jain, Ravi.
"Low cost emergency water purification technologies".
Waltham, MA:
Butterworth-Heinemann,
2014.
Electronic Resource.