Shringarpure, D. M., and A. N. Shah. “Some Trace Fossils from the Subathu Rocks of Nilkanth, Pauri-Garhwal, Himalaya”. Journal of Geological Society of India, vol. 23, no. 4, Apr. 1982, pp. 192-5, https://geosocindia.com/index.php/jgsi/article/view/65065.