Robert Caldwell, Wyatt J L, & Ramakrishna Pillai T(ed.). (1998). A comparative grammar of the Dravidian or South Indian family of languages (3rd rev. ed.). Asian Educational Services.

Robert Caldwell, Wyatt J L, and Ramakrishna Pillai T(ed.). A Comparative Grammar of the Dravidian or South Indian Family of Languages. 3rd rev. ed. New Delhi: Asian Educational Services, 1998.

Robert Caldwell, et al. A Comparative Grammar of the Dravidian or South Indian Family of Languages. 3rd rev. ed. Asian Educational Services, 1998.