This guide covers a set of high-quality sources of information for medieval history that can be a good starting point for your research.
Lexikon des Mittelalters & International Encyclopaedia for the Middle Ages
Combined encyclopedia for the Middle Ages (LexMA) and its supplement (IEMA).
Koninklijke Bibliotheek / Royal Library membership allows online access to all their digital collections and services.
For €7,50 a year for students (more information).
Which eBooks are available for the subject of History?