Jha, Neerja. “Palynological Dating of Coal-Bearing Sediments from the Bottapagudem Area, Chintalpudi Sub-Basin, Andhra Pradesh”. Journal of Palaeosciences 53, no. (1-3) (December 31, 2004): 61–67. Accessed April 29, 2024. https://jpsonline.co.in/index.php/jop/article/view/210.