Singh, Veena. “Some ‘Acritarchs’ and Other Microfossils from Barakar Stage of Lower Gondwanas, India”. Journal of Palaeosciences 17, no. (1-3) (December 31, 1968): 326–331. Accessed May 24, 2024. https://jpsonline.co.in/index.php/jop/article/view/811.