Chatterjee, Shiba Prasad (2004), Selected Works of Professor S.P. Chatterjee, Volume 1, National Atlas and Thematic Mapping Organisation, Department of Science and Technology, Government of India, पृ॰ 139, मूल से 12 जुलाई 2019 को पुरालेखित, अभिगमन तिथि 9 दिसंबर 2019
Chatterjee, Shiba Prasad (2004), Selected Works of Professor S.P. Chatterjee, Volume 1, National Atlas and Thematic Mapping Organisation, Department of Science and Technology, Government of India, पृ॰ 139, मूल से 12 जुलाई 2019 को पुरालेखित, अभिगमन तिथि 9 दिसंबर 2019
