Pillai G., . (1970). Sahakaranavum samuhya vikasanavum. : State Institute of Languages.
Pillai G.R, . 1970. Sahakaranavum samuhya vikasanavum. : State Institute of Languages.
Pillai G.R, . Sahakaranavum samuhya vikasanavum. : State Institute of Languages. 1970.