India. Registrar general and census commissioner & Narayanan, K. (1975). Census of India 1971. Series 9, Kerala: Economic tables. s.n.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रIndia. Registrar general and census commissioner और K. Narayanan. Census of India 1971. Series 9, Kerala: Economic Tables. s.n, 1975.
एमएलए (9वां संस्करण) प्रशस्ति पत्रIndia. Registrar general and census commissioner और K. Narayanan. Census of India 1971. Series 9, Kerala: Economic Tables. s.n, 1975.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.