KEMP, Alan C.; WOODCOCK, Martin W. The hornbills: Bucerotiformes. Oxford, New York, Tokyo: Oxford University Press, 1995. Dostupné online. ISBN019857729X. S. 155-156. (anglicky)
POONSWAD, Pilai; KEMP, Alan; STRANGE, Morten. Hornbills of the World – A Photographic Guide. Singapore: Draco Publishing, 2013. Dostupné online. ISBN978-981-07-3528-9. S. 154-155. (anglicky)
SHAW, George; SHAW, George; GRIFFITH. General zoology, or Systematic natural history. London: Printed for G. Kearsley, 1812. Dostupné online. doi:10.5962/bhl.title.1593. S. 37.
SHAW, George; SHAW, George; GRIFFITH. General zoology, or Systematic natural history. London: Printed for G. Kearsley, 1812. Dostupné online. doi:10.5962/bhl.title.1593. S. 37.
WIJERATHNE, Iresha; WICKRAMASINGHE, Sriyani. Behavioral Pattern of Endemic Sri Lanka Grey Hornbill (Ocyceros gingalensis) within the Breeding and Nonbreeding Seasons. International Journal of Biodiversity. 2018-03-11, roč. 2018, s. e9509785. Dostupné online [cit. 2023-11-13]. ISSN2314-4149. doi:10.1155/2018/9509785. (anglicky)
WIJERATHNE, Iresha; WICKRAMASINGHE, Sriyani. Behavioral Pattern of Endemic Sri Lanka Grey Hornbill (Ocyceros gingalensis) within the Breeding and Nonbreeding Seasons. International Journal of Biodiversity. 2018-03-11, roč. 2018, s. e9509785. Dostupné online [cit. 2023-11-13]. ISSN2314-4149. doi:10.1155/2018/9509785. (anglicky)
WIJERATHNE, Iresha; WICKRAMASINGHE, Sriyani. Behavioral Pattern of Endemic Sri Lanka Grey Hornbill (Ocyceros gingalensis) within the Breeding and Nonbreeding Seasons. International Journal of Biodiversity. 2018-03-11, roč. 2018, s. e9509785. Dostupné online [cit. 2023-11-13]. ISSN2314-4149. doi:10.1155/2018/9509785. (anglicky)