Jagadeesh Ram T A M; Sinha G P & Singh K P Lichen flora of Sundarbans Biosphere Reserve, West Bengal .-978-81-211-0812-6 - Bishen Singh Mahendra Pal Singh, Dehra Dun 2012 ISBN: 978-81-211-0812-6 Dewey Class. No.: I27.4462 P12/B27999