I'm looking to purchase a book, and dictionary because I have a signed english book that is over ten years old, and I don't want to start out learning the wrong thing. I hope I placed this in the correct category.
Is there an Academy of Sign Language or something like that which approves signs for new concepts? Are there sometimes disagreements between different bodies (like between Webster's vs. other dictionaries) regarding what signs are "official," which are "slang," and so forth?