Dyfyniad APA

(2011). Water and air quality directory 2011. Kerala state pollution control board.

Dyfyniad Arddull Chicago

Water and Air Quality Directory 2011. Thiruvananthapuram: Kerala state pollution control board, 2011.

Dyfyniad MLA

Water and Air Quality Directory 2011. Kerala state pollution control board, 2011.

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