The Oxford Dictionary of the Middle Ages by
"The Oxford Dictionary of the Middle Ages is an essential new reference work covering all key aspects of European history, society, and culture from 500 to 1500 A.D., as well as the Byzantine Empire, Islamic dynasties, and Asiatic peoples of the era. It is designed both for medievalists, who need a detailed and reliable reference tool, and for students and general readers seeking an accessible guide to the period. Over 800 scholars have assembled thousands of comprehensive entries, lavishly supplemented by hundreds of illustrations and dozens of maps."
Ancient Europe, 8000 B. C. to A. D. 1000 by
Examines the diverse peoples of early European civilization through a series of 212 essays, presented in chronological order. Coverage includes prehistoric origins through the early Middle Ages (8000 B.C. to A.D. 1000). Includes maps, photos, and chronologies. For the general reader.
Women and Gender in Medieval Europe by 
The Palgrave Dictionary of Medieval Anglo-Jewish History by 
Encyclopedia of Society and Culture in the Medieval World, 4-Volume Set by 
Encyclopedia of Medieval Literature by 
The Grove Encyclopedia of Medieval Art and Architecture by 
Medieval Science, Technology, and Medicine by By searching relevant topics in the library catalog (above) and adding the word <<sources>> to your search, you can find books that contain primary sources. Hint: you can further limit your search by language by selecting languages in the left-hand navigation of your search results.
Below are some other places to find primary sources online.
