Sinha, Anshu K. “Calcareous Nannofossils from Simla Hills, (Himalaya, India) With a Discussion of Their Age in the Tectono-Stratigraphic Column”. Journal of Geological Society of India 16, no. 1 (March 1, 1975): 69–77. Accessed September 20, 2024. https://geosocindia.com/index.php/jgsi/article/view/63504.