Beethoven and His World: A Biographical Dictionary - Clive, Peter (Oxford Oxford university press, 2001)
Peter Clive examines Beethoven's relations with the multitude of persons who formed his circle: relatives, friends, librettists, poets, publishers, artists, patrons, and musicians. With over 450 entries, this volume is the most comprehensive and up-to-date survey of the subject currently available in any language.