1. Bhadriraju Krishnamurti, 2003, ‘The Dravidian Languages’ Cambridge University Press, U. K.
2. David Crystal, 1997, ‘The Cambridge Encyclopedia of Language’, Cambridge University press, USA.
3. Charles Phillip Brown, 1903, ‘A Dictionary of mixed dialects and foreign words used in Telugu’ Victory Publishers, Vijayawada.
3. Dr. C. Thirupal Reddy, 1997, ‘Verb Morphology of Palkuriki Somana’s works’ unpublished Ph.D. Thesis submitted to Sri Venkateswara University, Tirupati.
4. Prof. D. Chenga Reddy, 1981, ‘A Sociolinguistic Study of the Place-Names of Chittoor District’ unpublished Ph.D. Thesis submitted to Sri Venkateswara University, Tirupati.
5. Telugu dailies and Television channels.