1. The rare plants of the Galapagos Islands and their conservation;Adsersen;Biological Conservation,1989
2. Contribution to the flora of Lahul valley, North West Himalaya;Aswal;J. of Economic and Taxonomic Botany,1985
3. Aswal, B.S., Mehrotra, B.N., (1994). Flora of Lahaul-Spiti (a Cold Desert in North West Himalaya) Bishen Singh Mehendra pal Singh, Dehra Dun, India
4. Threatened plant, animal, and fungus species in Swedish forests;Berg;Conservation Biology,1994
5. Champion, H.G., Seth, S.K., 1968. A Revised Survey of the Forest Types of India. Manager of Publications, Dehli, India