23.Roman History from Coins, Michael Grant. 1968.

24.The Commerce Between Roman Empire and India, Warmington, 1928.

25.‘Roman Coins found in India‘, R. Sewell, pp. 591-637, I.R.A.S., 1904.

26.‘Corpus of Tamil Brahmi Inscriptions‘, Iravatham Mahadevan, Seminar on Inscriptions, 1966.

27.Salem Manual.

28.Salem Gazeteer.

29.Coimbatore Manual.

30.Coimbatore Gazeteer.