The current, standard, work on the topic. Though this updates the previous set, it does not replace it. Articles are signed and include annotated bibliographies. The final volume includes an index and summaries of the articles in each volume. Includes 300 lengthy, signed articles organized by topic, not by person.
Final volume includes an index.
Find the person of interest. The dictionary does a nice job of describing how the individual's philosophy within a larger history of ideas. Encyclopedia of philosophy. Articles vary in length. Coverage of ancient, medieval, and early modern philosophers is very good.