Pollution Control Board, K. S. (2008). Water and Air quality directory 2008.
Chicago Edition CitationPollution Control Board, Kerala State. Water and Air Quality Directory 2008. Kerala, Pollution Control Board, Kerala State, 2008.
Cita MLAPollution Control Board, Kerala State. Water and Air Quality Directory 2008. 2008.
Atenció: Aquestes cites poden no estar 100% correctes.