(Sources in bold are those used most heavily)

Accounts of Revival by John Gillies
Anabaptism in Outline Edited by Walter Klaassen
The Anabaptist Story by William R. Estep
The Authorised Version: A Wonderful and Unfinished History by C.P. Hallihan
Balthasar Hubmaier: The Leader of the Anabaptists by Henry C. Vedder
Christian History Issue 46 (Vol. XIV, No.2) John Knox: The Thundering Scot
Creeds of Christendom Volume 1 & 3 by Philip Schaff
The Encyclopedia of World History Sixth Edition Peter Stearns, General Editor
Encyclopedia Britannica
The English Church in the Sixteenth Century by Craig R. Thompson (Folger Booklets on Tudor and Stuart Civilization)
Famous Women of the Reformed Church by James I. Good
Five English Reformers by J.C. Ryle
Foxe’s Christian Martyrs of the World by John Foxe
The Greatest Century of Reformation by Peter Hammond
The History of the Evangelical Churches of the Valleys of the Piemont by Samuel Morland
History of the Protestant Church in Hungary, From the beginning of the Reformation to 1850by J. Craig and J.H. Merle D’Aubigne
The History of Protestantism by Rev. James A. Wylie Books 1-24
History of the Christian Church: The German Reformation 1517-1530 by Philip Schaff
History of the Christina Church: The Swiss Reformation 1519-1605 by Philip Schaff
The History of the Reformation in Sweden by Lars Anton Anjou
History of the Progress and Suppression of the Reformation in Italy by Thomas M’Crie
History of the Reformation Vol. 2 In the Lands Beyond Germany by Thomas M. Lindsay
History of the Reformation of the Sixteenth Century Volume 1-5 by J. H. Merle D’Aubigne
History of the Reformation in the Time of Calvin Volume 1-8 by J. H. Merle D’Aubigne
The Huguenots or Reformed French Church by William Henry Foote
Huldreich Zwingli: The Reformer of German Switzerland by Samuel Macauley Jackson
An Introductionto the Puritans by Erroll Hulse
The Israel of the Alps: A History of the Waldenses by Alexis Muston
The Jewel in the King’s Crown by David Allen
The Life of Andrew Melville by Thomas M’Crie
Life of John Knox by Thomas M’Crie
The Life of William Farel by Frances Bevan
Martin Luther: Oak of Saxony by Edwin P. Booth
Martin Luther by Harry Emerson Fosdick
Martin Luther by May McNeer and Lynd Ward
Martin Luther: The Hero of the Reformation by Henry Eyster Jacobs
Mennonite Church History by J.S. Hartzler
Mennonites in Europe by John Horsch
Menno Simons’ Life and Writings (Biography by Harold S. Bender; Writings Selected and Translated from the Dutch by John Horsch)
Moravians in Europe and America 1415-1865 Hidden Seed and Harvest by Chester S. Davis
Philip Melanchthon: The Protestant Preceptor of Germany by James William Richard, D.D
The Preachers of Scotland by William G. Blaikie
A Reformation Reader: Primary Texts with Introductions Edited by Denis R. Janz
The Reformation in Spain by Thomas M’Crie
Reformed Church in the Netherlands by Maurice G. Hansen
The Scandinavian Reformation Edited by Ole Peter Grell
The Scots Worthies by John Howie
The Story of the Scottish Church by Thomas McCrie
Theodore Beza: The Counsellor of the French Reformation 1519 – 1605 by Henry Martyn Baird
Thomas Cranmer and the English Reformation 1489 – 1556 by Albert Frederick Pollard
Through Five Hundred Years: A Popular History of the Moravian Church by Allen W. Schattschneider
The Waldensians: The First 800 Years by Giorgio Tourn
Wales and the Welsh Bible from Trinitarian Bible Society-Quarterly Record Issue 603