2000 Years of Christ's Power
is a five volume set of books covering all of church history. This is meant to be more of a textbook than a casual read but gives great insight and depth into church history.
50 World Changing Events in Christian History
is good introductory material to church history. This is an easy and enjoyable read.
Documents of the Christian Church
is a collection of primary sources from the ancient church through the modern day that covers key controversies, topics and events.
The Heresy of Orthodoxy
is a scholarly work looking at, "How contemporary culture's fascination with diversity has reshaped our understanding of early christianity".