Chandrahasan, U. (1992). Parisara malineekaranam = Environmental pollution (2.). SIL.
Dyfyniad Arddull ChicagoChandrahasan, U. Parisara Malineekaranam = Environmental Pollution. 2. Trivandrum: SIL, 1992.
Dyfyniad MLAChandrahasan, U. Parisara Malineekaranam = Environmental Pollution. 2. SIL, 1992.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.