Tiwari, R.S., and Ram-Awatar. “Palyno-Dating of Nidpur Beds, Son Graben, Madhya Pradesh”. Journal of Palaeosciences 38 (December 31, 1989): 105–121. Accessed November 21, 2024. https://jpsonline.co.in/index.php/jop/article/view/1645.