Bhargava, O. N., and U. K. Bassi. “Algae from the Silurian Manchap Formation, Tidong Valley (Kinnaur), Himachal Himalaya”. Journal of Geological Society of India, vol. 29, no. 5, May 1987, pp. 500-2, https://geosocindia.com/index.php/jgsi/article/view/66471.