Peter MarshallThe Oxford Illustrated History of the Reformation

Some of the most important scholars of the Reformation period are represented here, including Marshall himself. The essays are varied treatments by the foremost minds in the field. In writing about the Reformation in graduate school, I found this text was my essential library and the starting point for most everything else. It has a broad scope, encompassing theological, cultural and political aspects of the upheaval called "Reformation."

Very thorough work.