Empires in the Middle Ages: The Islamic Caliphate
Cause & Effect: Ancient Civilizations: Ancient China
Cause & Effect: Modern Wars: World War II
Power and Religion in Medieval and Renaissance Times: The Emergence of Modern Europe
Cause & Effect: Modern Wars: World War I
Cause & Effect: Modern Wars: The Vietnam War
The Britannica Guide to Islam: The Islamic World from 1041 to the Present
Cause & Effect: Modern Wars: The Cold War
The Britannica Guide to Islam: The Islamic World from Prehistory to 1041
Primary Sources in World Warfare: World War I
World History: The Black Death: Bubonic Plague Attacks Europe
A Political and Diplomatic History of the Modern World: The Cold War
The World of Renaissance Italy: A Daily Life Encyclopedia
Analyzing the Issues: Critical Perspectives on Terrorism
World History: World War I and the Rise of Global Conflict
Warriors Around the World: Conquistadors
Sacred Texts Interpreted: Religious Documents Explained
Primary Sources in World Warfare: World War II