I thought this was a very decent overview of mennonite history and beliefs. It is by no means a detailed description of mennonite theology or current practices, but it does give a good glimpse of the basics.

If you want an introductory read, this is it. For more advanced theological resources, look elsewhere.

This book provides a good baseline and is written by one of the best-known writers in Mennonite circles. It gives a good overview of the basic traditional Mennonite beliefs. By reading this book and comparing the text with current beliefs and practices in the Mennonite Church and General Conference Mennonite Church, the reader can see how the church has drifted from its traditional beliefs.