Rujukan Rhyticeros cassidix

  1. 1 2 3 4 BirdLife International (2017). "Rhyticeros cassidix". Senarai Merah Spesies Terancam IUCN. 2017: e.T22682525A117182222. doi:10.2305/IUCN.UK.2017-3.RLTS.T22682525A117182222.en. Dicapai pada 19 November 2021.
  2. ↑ "Appendices | CITES". cites.org. Dicapai pada 2022-01-14.
  3. 1 2 Josep del Hoyo; Andrew Elliott; David Christie, penyunting (2010). Handbook of the Birds of the World. Barcelona: Lynx Edicions.
  4. ↑ Kinnaird, M. F. (1998). "Evidence for effective seed dispersal by the Sulawesi red-knobbed hornbill, Aceros cassidix". Biotropica. 30 (1): 50–55. doi:10.1111/j.1744-7429.1998.tb00368.x.