Alvin Plantinga's Warranted Christian Belief is available to read online as well. The trifecta is complete! :-)
Thank-you for posting these links.
Dave Armstrong has links to online versions of 12 of Alvin Plantinga's works here:http://socrates58.blogspot.com/2011/08/twelve-seminal-alvin-plantinga-books.html
According to Dave, most are freely available online.
AP, Dave is only linking to the Amazon and GoodReads pages for those books. I couldn't find any online content from following his links.