Dyfyniad APA

(2012). Water and air quality directory 2012. Kerala Pollution Control Board.

Dyfyniad Arddull Chicago

Water and Air Quality Directory 2012. Kerala Pollution Control Board, 2012.

Dyfyniad MLA

Water and Air Quality Directory 2012. Kerala Pollution Control Board, 2012.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.