Negi, P. S. “A Report on Occurrence of <I>Swertia chirayita< I> (Roxb.) Buch.-Ham. Ex C.B. Clarke in Kinnaur District of Himachal Pradesh”. Indian Forester, vol. 143, no. 11, Nov. 2017, pp. 1213-4, doi:10.36808/if/2017/v143i11/119710.