Champion, H.G. and Seth, S.K. 1968. A Revised Survey of the Forest Types of India. Manager of Publications, Government of India, New Delhi.
IUCN. 1996. 1996 Red List of Threatened Animals. IUCN, Gland, Switzerland.
Johns, A.D. 1983. Wildlife can live with logging. New Scientist, 99, 206–211.
Johns, A.D. 1985. Selective logging and wildlife conservation in tropical rainforest: problems and recommendations. Biological Conservation, 31, 355–375.
Johns, A.D. 1986. Effects of selective logging on the ecological organization of a peninsular Malaysian rainforest avifauna. Forktail, 1, 65–79.
Johns, A.D. 1987. The use of primary and selectively logged rainforest by Malaysian hornbills (Bucerotidae) and implications for their conservation. Biological Conservation, 40, 179–190.
Johns, A.D. 1989. Recovery of a Peninsular Malayasian rainforest avifauna following selective timber logging: the first twelve years. Forktail, 4, 89–106.
Kannan, R. 1994. Ecology and conservation of the great pied hornbill (Buceros bicornis) in the Western Ghats of southern India. PhD thesis, University of Arkansas.
Katti, M., Singh, P., Manjrekar, N., Mukherjee, S. and Sharma, D. 1992. An ornithological survey in eastern Arunachal Pradesh, India. Forktail, 7, 75–89.
Kemp, A.C. 1979. A review of hornbills: biology and radiation. The Living Bird, 17, 105–136.
Kemp, A.C. and Kemp, M. I. 1975. Report on a study of hornbills in Sarawak, with comments on their conservation. WWF, Kuala Lumpur, Malaysia.
Lambert, F. 1991. The conservation of fig-eating birds in Malaysia. Biological Conservation, 58 (1), 31–40.
Leighton, M. 1982. Fruit resources and patterns of feeding, spacing and grouping among sympatric Bornean hornbills (Bucerotidae). PhD thesis, University of California (Davis).
Leighton, M. 1986. Hornbill social dispersion: variations on a monogamous theme. In Ecological Aspects of Social Evolution (eds Rubenstein, D. and Wrangham, R. W.), pp. 108–130. Princeton University Press, Princeton, New Jersey.
Leighton, M. and Leighton, D. R. 1983. Vertebrate responses to fruiting seasonality within a Bornean rain forest. In Tropical Rain Forest: Ecology and Management(eds Sutton, S. L., Whitmore, T. C. and Chadwick, A. C.), pp. 181–196. Blackwell Scientific Publications, Oxford.
Norusis, M.J. 1990. SPSS/PC+4.0 Base Manual – Statistical Data Analysis.SPSS Inc.
Patel, A. 1996. Strangler fig–host associations in roadside and deciduous forest sites. Journal of Biogeography, 23 (4), 409–414.
Payne, J.B. 1980. Competitors. In Malayan Forest Primates (ed. Chivers, D. J.), pp. 261–277. Plenum Press, New York and London.
Poonswad, P. 1995. Nest site characteristics of four sympatric species of hornbills in Khao Yai National Park, Thailand. Ibis, 137, 183–191.
Poonswad, P. and Tsuji, A. 1994. Ranges of males of the Great Hornbill Buceros bicornis, Brown Hornbill Ptilolaemus tickelii and Wreathed Hornbill Rhyticeros undulatus in Khao Yai National Park, Thailand. Ibis, 136, 79–86.
Poonswad, P., Tsuji, A. and Ngampongsai, C. 1983. A study of the breeding biology of hornbills (Bucerotidae) in Thailand. Proceedings of the Jean Delacour/ICFB Symposium on Breeding Birds in Captivity. 02 24–27, 1983, Los Angeles, California, USA.
Poonswad, P., Tsuji, A. and Ngampongsai, C. 1986. A comparative ecological study of four sympatric hornbills (Family Bucerotidae) in Thailand. Acta XIX Congressus Internationalis Ornithologici. Vol. II, 06 22–29, 1986, Ottawa, Canada. University of Ottawa Press.
Poonswad, P., Tsuji, A. and Ngampongsai, C. 1987. A comparative study on breeding biology of four sympatric hornbill species (Family Bucerotidae) in Thailand with implications for breeding in captivity. Proceedings of the Jean Delacour/ICFB Symposium on Breeding Birds in Captivity. 02 11–15, 1987, Los Angeles, California, USA.
Rijksen, H.D. 1978. A Field Study of the Sumatran Orang-utan (Pongo pygmaeus abelii, Lesson, 1827): Ecology, Behaviour and Conservation. H. Veenman and Zonen, Wageningen, Holland.
Singh, P. 1991. Avian and mammalian evidences in Pakhui Wildlife Sanctuary in East Kameng district, Arunachal Pradesh. Arunachal Forest News, 9 (2), 1–10.
Singh, P. 1995. Recent bird records from Arunachal Pradesh. Forktail, 10, 65–104.
Suryadi, S., Kinnaird, M.F. and O'Brien, T.G. 1996. Home range and daily length of the Sulawesi redknobbed hornbills Aceros cassidix during the nonbreeding season. Abstract, The Second International Asian Hornbill Workshop, 10–18 04 1996.
Wells, D.R. 1985. The Forest avifauna of Western Malesia and its conservation. In Conservation of Tropical Forest Birds (eds Diamond, A. W. and Lovejoy, T. E.), pp. 213–232. International Council for Bird Preservation, Cambridge.
Wildlife (Protection) Act, (India). 1972. Natraj Publishers, Dehradun.