Most are entertaining and informative. Amazon Books Good place for ordering books on the Internet. They have books that are hard to find, great discounts and fast delivery of your books. Contain areas of interest with author interviews and such. This is the web site for the Barnes and Noble book chain.
Readers can order many books here.
They have free online courses as well. It is a helpful source for finding some out of print books too. This site is helpful for writers. Here you can research Celtic material. They have links and articles to Celtic myths and history.