Panikkar, K. M. (1969). Geographical factors in Indian history (2nd ed.). Bharatiya Vidya Bhavan.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPanikkar, K. M. Geographical Factors in Indian History. 2nd ed. Bharatiya Vidya Bhavan, 1969.
एमएलए (9वां संस्करण) प्रशस्ति पत्रPanikkar, K. M. Geographical Factors in Indian History. 2nd ed. Bharatiya Vidya Bhavan, 1969.
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