1. Aitken, E. and Long, D.G. (1996). Notes relating to the flora of Bhutan: XXX. Gentianaceae. Edinb. J. Bot., 53(1): 81-94.
2. Aitken, E. (1999). Gentianaceae: In Long D.G. (ed.) Flora of Bhutan, 2(2): 602-656. Royal Botanic Garden, Edinburgh.
3. Bennet, S.S.R. (1979). Flora of Howrah District. International Book Distributors. Dehra Dun.
4. Biswas, K.P. (1966). Plants of Darjeeling and Sikkim Himalayas. Calcutta.
5. Burtt, B.L. (1965). Notes chiefly nomenclatural on Gentianaceae of Pakistan and India. Notes Roy. Bot. Gard. Edinburgh, 26: 269-278.