Although now somewhat dated, still usually the best place to begin research on any women writer writing in English. Bibliographies in the back list all standard sources and highlight feminist essays. A Guide to Books, 1963-1975. With an Appendix on Books Published 1963-1975 1981. A standard reference in women's studies.
Annotations are long and extremely informative.
A good place to go to find summaries of feminist classics. The Dictionary of Feminist Theory . Columbus, Ohio State U P, 1990. Has entries for topics, terms, and people's names. Range of information is helpful to undergraduates but also useful for more advanced researchers.