Bourne, R. (2023). Nilambur Valley Working plan Volume I Description History and Statistics. 1917-1918. The Superintendent Government Press, Kerala.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBourne, R. Nilambur Valley Working Plan Volume I Description History and Statistics. 1917-1918. The Superintendent Government Press, Kerala, 2023.
एमएलए (9वां संस्करण) प्रशस्ति पत्रBourne, R. Nilambur Valley Working Plan Volume I Description History and Statistics. 1917-1918. The Superintendent Government Press, Kerala, 2023.
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