Chandrika Sankaranarayanan. (1992). Vayalar Ramavarma: Rithubhethangalkku varnam pakarnna kavi.
Dyfyniad Arddull ChicagoChandrika Sankaranarayanan. Vayalar Ramavarma: Rithubhethangalkku Varnam Pakarnna Kavi. Kottayam, DCB, 1992.
Dyfyniad MLAChandrika Sankaranarayanan. Vayalar Ramavarma: Rithubhethangalkku Varnam Pakarnna Kavi. 1992.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.