- Catholic Encyclopedia: Bulla Aurea (Golden Bull)
 - Law issued by Charles IV in 1356 that transformed the empire from a monarchy into an aristocratic federation in which seven Electors voted on new emperors. - Charles V (1500-1558) (1)
- Conflict of Authority: Four Documents from the Investiture Controversy
- Introduction and texts relating to the 11th-century conflict between the Popes and Holy Roman Emperors over the right of princes to give appoint church officials.
- End of Europe's Middle Ages: Holy Roman Empire
- Historical overview from the 14th to 16th centuries. Includes illustrations and maps.
- Frederick I (c.1125-1190) (3)
- German Reigning Houses: Holy Roman Empire
- Provides information on the Imperial nobility and constitution, secular and ecclesiastical Estates, maps, and more.
- Holy Roman Empire Essays
- Collection of articles.
- Holy Roman Empire, The
- Originated with the coronation of Otto I in 962 and endured until Francis II renounced his imperial title in 1806. Features the role of the emperor and Reichstag, structure of the empire, and more.
- Medieval Sourcebook: Empire and Papacy
- Documents related to the Investiture Controversy, Emperor Frederick I Barbarossa, Pope Innocent III, Frederick II, and the medieval Papacy.
- Modern History Sourcebook: Decline of the Holy Roman Empire and the Rise of Prussia, The
- Includes excerpts from German texts.
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