1. Bir, S.S. (1988). Proceedings of the Seventy fifth Indian Science Congress (Platinum Jubilee Session), Pune.
2. Chandra, S. (2000). The Ferns of India (Enumeration, Synonyms and Distribution). International Book Distributors, Dehra Dun.
3. Choudhary, N.P. (1973). The Pteridophytic flora of the Upper Gangetic Plain. Navyug Traders, New Delhi.
4. Dixit, R.D. (1984). A Census of the Indian Pteridophytes. Bot. Sur. of India, Howrah, 1-177.
5. Haines, H.H. (1924a). The Botany of Bihar and Orissa (Cyatheaceae). Adelaid and Sons and West Newman Ltd., London. 6: 1183.
6. Haines, H.H. (1924b). The Botany of Bihar and Orissa (Pteridophyte). Adelaid and Sons and West Newman Ltd., London 6: 1217-1219.
7. Knight, D.H. (1975). A phytosociological analysis of species rich tropical forest on Barro Colorado Island, Panama. Ecological Monograph., 45: 259-284. https://doi.org/10.2307/1942424
8. Kumari, Alka; Srivastava, R.B. and Tiwari, Indu (2003). Community structure and frequency of Helminthostachys zeylanica (L.) Hooker. in a mixed population. Indian Fern J., 20: 42-47.
9. Margalef, D.R. (1958). Information theory in ecology. General System Bulletin, 3: 36-71.
10. Misra, R. (1968). Ecology Work Book. Oxford and IBH Publishing Company, Culcutta.
11. Mooney, H.A.; Lubchenco, J.; Dirzo, R. and Sala, Q.E. (1995). Biodiversity and ecosystem functioning: Ecosystem analysis. Global Biodiversity assessment, UNEP, Cambridge Nadine. Edited by V.H. Heywood and R.T. Watson, 326-345 pp.
12. Pielou, E.C. (1966). The measurement of diversity in different types of biological collections. J. Theoretical Biology, 13: 131-144. https://doi.org/10.1016/0022-5193(66)90013-0
13. Shannon, C.E. and Wiener, W. (1963). The Mathematical Theory of Communication. University of Illinois Press, Urbana.
14. Simpson, E.M. (1949). Measurement of Diversity. Nature, 163: 688. https://doi.org/10.1038/163688a0
15. Singh, J.S.; Rawat, Y.S. and Chaturvedi, O.P. (1984). Replacement of Oak forest with Pine in the Himalaya affects the nitrogen cycle. Nature, 11: 54-60. https://doi.org/10.1038/311054a0
16. Singh, L. and Singh, J.S. (1991). Species structure, dry matter dynamics and carbon flux of a dry tropical forest in India. Annals of Botany, 68: 263-273. https://doi.org/10.1093/oxfordjournals.aob.a088252
17. Srivastava, R.B. (1985). Cytotaxonomical studies on fern flora of Balmikinagar. Ph.D. Thesis, B.R.A.B.U. Muzaffarpur, Bihar.
18. Srivastava, R.B. and Verma, R.M.P. (1991). Ethno botanical importance of fern flora of Balmikinagar. Indian Fern J., 6: 11-15.
19. Tripathi, K.P. (2001). Ecology of a rehabilitated forest on sodic wasteland. Ph.D. Thesis, Lucknow University, Lucknow.
20. Tripathi, K.P.; Singh, Bajrang and Jain, R.K. (2004a). Diversity and productivity of plantation developed from sodic wasteland. Indian J. of Forestry, 72(2): 187-191.
21. Tripathi, K.P.; Tripathi, S.; Selven, T.; Kumar K.; Singh, K.K.; Mehrotra, S. and Pushpagandan, P. (2004b). Community structure and species diversity of Saddle Peak forests in Andaman. Tropical Ecology, 45(2): 241-250.
22. Tripathi, K.P. and Singh, B. (2007). Community analysis in Natural and Plantation Forests of Katarniaghat Wildlife Sanctuary in North India (in Press).