In addition to the resources relating to the different sign languages, I have included a number of other links should you be interested in finding out more about diff
Maybe have a page of useful links. Like charities in the main HOL countries, different types of hearing aids and cultural reactions and how to deal with a deaf person/ being deaf wrt communicating. Also links to different types of hearing loss and stuff. Maybe?
Hearing Aids
Types of Hearing Aids
http://www.mayoclinic.org/diseases-conditions/hearing-loss/in-depth/hearing-aids/art-20044116
Comparison of Hearing Aid Brands
http://www.hearingplanet.com/hearing-aids/comparison
Deaf and/or Sign Language Associations
Dealing with Deafness