Oxford Bibliographies offers peer reviewed annotated bibliographies which will help you to narrow the vast number of citations to the best scholarship on a given topic. Bibliographies are browseable by subject area and keyword searchable.
Oxford's Medieval Studies explores European and Mediterranean civilization from the 4th to the 15th centuries. From history to literature, from art to archaeology, from religion to gender studies, this resource contains several primary source texts and a range of other electronic resources.
Oxford's Renaissance and Reformation consists of detailed annotated bibliographies for important topics in Western history and culture from the 14th through 17th centuries.