Most of the textbooks on technical analysis will have chapters on moving averages. Two of the best textbooks are:
John Murphy Technical Analysis of the Finacial Markets
Martin Pring Technical Analysis Explained
Dr Alexander Elder has a method based heavily on moving average envelopes in his book Come Into My Trading Room, which I recommend for much more as well.
There are articles about moving averages which I have published in the ATAA Journal.
There are some videotapes in the ATAA video library. The ones by Berovic stand out in my mind, but I cannot recall now which tape. Look for the review of those tapes that I think was published in the ATAA Journal at one point.
There are some Q&As on moving averages on my free access web site in the Ask Colin section.
There are some articles on moving averages on my subscription web site.
Dawn Bolton-Smith has some interesting ways of using triple moving averages. Look for her articles in back issues of Your Trading Edge magazine.