Chakravarty, A. K. (1975). Origin and development of Indian calendrical science. Indian Studies, Past & Present.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रChakravarty, Apurba Kumar. Origin and Development of Indian Calendrical Science. Indian Studies, Past & Present, 1975.
एमएलए (9वां संस्करण) प्रशस्ति पत्रChakravarty, Apurba Kumar. Origin and Development of Indian Calendrical Science. Indian Studies, Past & Present, 1975.
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