Sonowal, Poly, et al. “Petrography and Geochemistry of Sandstones of Eocene Kopili Formation, Shillong Plateau: Implications on Paleo-Weathering, Provenance and Tectonic Setting”. Journal of Geological Society of India, vol. 98, no. 2, Feb. 2022, pp. 219-31, doi:10.1007/s12594-022-1962-9.