Lakhanpal, R., S. Sah, and S. Dube. “Further Observations on Plant Microfossils from a Carbonaceous Shale (Krols) Near Naini Tal, With a Discussion on the Age of the Beds”. Journal of Palaeosciences, vol. 7, no. (1-2), Dec. 1958, pp. 111-20, doi:10.54991/jop.1958.577.