Most of the links have Amazon links where you can purchase if you wish. Some of the books are out-of-print. I have found bookfinder.com, abebooks.com, and alibris.com to be tremendous resources for finding and comparing cost of older books.
Consider making a direct contribution to help keep is-it-true.org on the Net by clicking on my Amazon honr system contribution paybox.
FYI if you click on any of my Amazon book, movie, or music links and purchase anything from Amazon, is-it-true.org will get a small percentage. Consider coming back to my site and getting into Amazon from one of my Amazon links, if you are going to purchase an item. It will help keep my site on the Net.
