Books
Clayton, Susan and Meyer, Gene. (2009). Conservation Psychology: Understanding and Promoting Human Care for Nature. Wiley-Blackwell.
Cremedes, Marc and Ng Soon Chye.(2012). Hornbill in the City: A conservation approach to hornbill study in Singapore. National Parks
Kinnard Margaret F. and O’Brien, Timonthy G. (2008). The Ecology and Conservation of Asian Hornbills: Farmers of the Forest. University Of Chicago Press
Winzeler, Robert L. (2004). The Architecture of Life and Death in Borneo. Univ of Hawaii Pr
Websites
http://ibanology.wordpress.com/2013/04/08/1075/
http://www.innovationmagazine.com/innovation/volumes/v10n1/coverstory3.shtml
http://newshub.nus.edu.sg/news/1002/PDF/HORNBILL-tnp-17feb-p12&13.pdf
http://www.theborneopost.com/2012/10/21/hornbills-revered-but-endangered/
http://www.metmuseum.org/toah/works-of-art/2007.359