John Marr (1958), The eight Tamil anthologies with special reference to Purananuru and Pattirruppattu, SOAS, University of London, page 9; The Chronology Of The Early Tamils, KN Sivaraja Pillai, University of Madras, page 18
Stein, Burton (1977). "Circulation and the Historical Geography of Tamil Country". The Journal of Asian Studies. 37 (1). Cambridge University Press: 7–26. doi:10.2307/2053325. JSTOR2053325. S2CID144599197.
Shenoy, Amritha V. (2018). "International humanitarian law in ancient India: a multicivilisational perspective". Indian Journal of International Law. 58 (3–4). Springer Science: 425–451. doi:10.1007/s40901-019-00102-y. S2CID182614568.
jstor.org
Stein, Burton (1977). "Circulation and the Historical Geography of Tamil Country". The Journal of Asian Studies. 37 (1). Cambridge University Press: 7–26. doi:10.2307/2053325. JSTOR2053325. S2CID144599197.
M. G. S. Narayanan (1982). "The Warrior Settlements of the Sangam Age". Proceedings of the Indian History Congress. 43: 102–109. JSTOR44141220.
Stein, Burton (1977). "Circulation and the Historical Geography of Tamil Country". The Journal of Asian Studies. 37 (1). Cambridge University Press: 7–26. doi:10.2307/2053325. JSTOR2053325. S2CID144599197.
Shenoy, Amritha V. (2018). "International humanitarian law in ancient India: a multicivilisational perspective". Indian Journal of International Law. 58 (3–4). Springer Science: 425–451. doi:10.1007/s40901-019-00102-y. S2CID182614568.