Bibliography of bibliographic sources:
Beethoven-Bibliographien. Compiled by Karl Stock, Rudolf Heilinger, Marylene Stock. Graz: Selbstverlag Stock & Stock, 1986. 78 pp.
Includes 385 citations for works up to 1985 containing Beethoven bibliographies. Indexed by title and editor.
Beethoven Abstracts. Compiled and annotated by Donald MacArdle, but completed and edited after his death in 1964 by Sonja Pogodda. Detroit: Information Associates, 1973. 432 pp.
Lots of problems here, but a useful annotated bibliography all the same. Abstracts primary and secondary periodicals.
Beethoven Gateway. Co-directed by William Meredith and Patricia Stroh at the Ira F. Brilliant Center for Beethoven Studies, San Jose State University. 1990 - .
The Beethoven Gateway is designed to be a comprehensive, computer-based Beethoven bibliography with enhanced online search capabilities. Over 14,000 bibliographic records have been entered to date.