This book is by AARP. I highly recommend it. It covers everything; working (or not), money, travel, moving, lifestyles, health, retirement areas that are single women friendly, etc. They don't miss a thing in this book. They even talk about traveling in an RV, and WomenRV.com is also mentioned in there!
It is easy to read and has tons of information and lists lots of places to find more information.
Here is a link to it on Amazon...
http://www.amazon.com/Single-Womans-Gui ... retirement