All asl classes on the college level have books and software the only difference when you study on your own is you don't get the interaction and help from the teacher or those learning asl with you. The best software, or the standard used, is signing naturally. You can get that online from the publisher, Signing Naturally
Check out lifeprint also, thats an excellent place online to learn asl.
Oh, i think I did a repeat. Opps lol
