Thieme-Becker-Vollmer
German biographical dictionary of artists supplemented by Vollmer's Allgemeines Lexikon der bildenden Künstler des XX. Jahrhunderts (English: General Dictionary of Artists of the 20th Century)
German biographical dictionary of artists supplemented by Vollmer's Allgemeines Lexikon der bildenden Künstler des XX. Jahrhunderts (English: General Dictionary of Artists of the 20th Century)