Original: T. K. Velu Pillai , ( 1940 ) '' The Travancore State Manual '' ; 4 volumes ; Trivandrum Caldwell , R ( 1998 ) '' A comparative grammar of the Dravidian or South-Indian family of languages '' 3rd ed .
Simplified: Robert Caldwell/PERSON. , '' A comparative grammar of the Dravidian or South-Indian family of languages '' 3rd ed .