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Rajam, V. S. (1985), "The Duration of an Action-Real or Aspectual? The Evolution of the Present Tense in Tamil", Journal of the American Oriental Society, 105 (2), ss. 277-291, doi:10.2307/601707, JSTOR601707 at pp. 284–285
Stein, B. (1977), "Circulation and the Historical Geography of Tamil Country", The Journal of Asian Studies, 37 (1), ss. 7-26, doi:10.2307/2053325, JSTOR2053325
Rajam, V. S. (1985), "The Duration of an Action-Real or Aspectual? The Evolution of the Present Tense in Tamil", Journal of the American Oriental Society, 105 (2), ss. 277-291, doi:10.2307/601707, JSTOR601707 at pp. 284–285