Kesavan, N. R. (1971). Gramavikasanam. State institute of languages.
Dyfyniad Arddull ChicagoKesavan, Nair R. Gramavikasanam. Trivandrum: State institute of languages, 1971.
Dyfyniad MLAKesavan, Nair R. Gramavikasanam. State institute of languages, 1971.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.