* The Reformation: A Global History (2017)
* The Lutheran Reformation (2006)
* The Church in History (2005)
* The Great Reformation: A Comprehensive History (2003)
* Europe in the Early Modern Era: An Introduction (2002)
* The Reformation in the Netherlands: A Study in Conflict (1997)
* The Calvinists: A History of the Reformed Tradition (1995)
* The Church in the World: Studies in Church History (1994)
* Reform and Renewal in the Medieval Church: A Study in the Charismatic and Devotional Revival of the Twelfth Century (1992)
* The Medieval Church: A History of the Papacy and the European Church, 1050-1350 (1990)
* The Origins of the Reformation (1988)
* Christ and Culture in the Middle Ages (1986)
Articles and Essays
* "The Legacy of the Reformation: Impact and Influence on Western Culture" (2019)
* "Martin Luther: A Reformer for All Seasons" (2017)
* "The Reformation and the Modern World" (2016)
* "The Legacy of Calvin: A Reformer for the Modern World" (2015)
* "The Rise of Protestantism in Europe: A Historical Overview" (2014)
* "The Reformation and the Catholic Church: A Complex Relationship" (2013)
* "The Reformation in Scandinavia" (2012)
* "The Reformation and the English Church" (2011)
* "The Reformation in France" (2010)
* "The Reformation and the Anabaptists" (2009)