Sah, S., and S. Dutta. “Palynostratigraphy of the Tertiary Sedimentary Formations of Assam: 2. Stratigraphic Significance of Spores and Pollen in the Tertiary Succession of Assam”. Journal of Palaeosciences, vol. 16, no. (1-3), Dec. 1967, pp. 177-95, doi:10.54991/jop.1967.518.