Sankaran Unni, K. (1974). Paristhiti vijnanathinte moola tatvangal. State Institute of Languages.
Dyfyniad Arddull ChicagoSankaran Unni, K. Paristhiti Vijnanathinte Moola Tatvangal. Trivandrum: State Institute of Languages, 1974.
Dyfyniad MLASankaran Unni, K. Paristhiti Vijnanathinte Moola Tatvangal. State Institute of Languages, 1974.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.