How to Answer a Jehovah's Witness by Robert A. Morey. 1980, ISBN 0-87123-206-5. Purchased on 2-17-2012 for $ .01 + 3.99 s&h from Thrift Books via Amazon Marketplace.
This book purports to teach Evangelical Christians how to talk with and convert Jehovah Witnesses who might come to their house to promote their religion. The idea of the book is to prove that the Watchtower Society promotes false prophecies and that therefore their version of religion is false.
The real way to talk to them is to just not answer that door and whatever you do don't give them any money or let them in your house!