Negi, P. S. (2017) “A Report on Occurrence of <I>Swertia chirayita</I> (Roxb.) Buch.-Ham. Ex C.B. Clarke in Kinnaur District of Himachal Pradesh”, Indian Forester, 143(11), pp. 1213–1214. doi: 10.36808/if/2017/v143i11/119710.