Identification guide for ivory and ivory substitutes, World Wildlife Fund and Conservation Foundation. http://www.cites.org/eng/resources/pub/e-ivory-guide.pdf
Ivory: Identification and regulation of a precious material, by Hornbeck, S., 2010, National Museum of Aftrican Art Conservation Laboratory, Smithsonian, http://africa.si.edu/research/ivory.pdf
Society for historical Archaeology. ID and conservation needs of bone, antler and ivory objects http://www.sha.org/research_resources/conservation_faqs/treatment.cfm#E
Distinguishing African and Indian elephant ivory is very problematic - this website may provide some new insites! http://www.brunching.com/elephants.html
The Key Centre for Polymer Colloids, University of Sydney, Module 9.5.1. Replacing natural products ivory and bakerlite
Development from ivory to composition billiard balls (Celluloid, Bonzoline, Crystalate and Vitalite) from The English Amateur Billiards Association web site, A Brief History of Billiards and the Tools of the Trade, by Peter Ainsworth.