William W. Kibler, Grover A Zinn. A one-volume reference that focuses on France. Strayer, Joseph R., gen. Dictionary of the Middle Ages . A major reference source in this area.
Bibliographies are mostly in English.
A Bibliographical Guide . The selection of about nine thousand entries has been made in order to provide a topical classification of the fundamental and significant books and monographs, published through 1980, dealing with the period from the third century A.D. to the sixteenth. Arrangement is by subject under chapter headings. Comprehensive indices list entries by authors, editors, and by topics. Frey, Linda, Marsha Frey and Joanne Schneider, Comps.