Bynagle, Philosophy, a Guide to the Reference Literature, Remote Storage B 72 .B97 2006. Annotates leading reference works in the field, general bibliographies, encyclopedias, dictionaries, indexes to periodical literature, specialized bibliographies on schools, periods, branches, countries, and individual philosophers. Also concordances and indexes to works of individual philosophers. Some information on web sites. See chapter 12, Western Philosophy: Medieval and Renaissance, pp. 151-164.
DeGeorge, Guide to Philosophical Bibliography and Research, Remote Storage Z 7125 .D445. Similar to the above work in purpose. Selectively annotated with many entries per page. For the medieval period see especially pages 19-20 and 32-41.