found: Der Welsche Gast des Thomasîn von Zerclaere, 1974:title page (Ewald Vetter)
found: Triumphkreuz im Dom zu Lübeck, 1977:title page (Ewald M. Vetter [contributor])
found: LC in RLIN, September 22, 1988(hdg.: Vetter, Ewald M.; usage: Ewald M. Vetter)
found: Speculum salutis : Arbeiten zur christlichen Kunst, 1994:cover (Ewald M. Vetter) jacket (born 1922 in Mannheim)
found: Deutsche Nationalbibliothek online catalog, viewed January 8, 2020(authorized access point: Vetter, Ewald M.; other data in authority record: professor and art historian; born 1922 in Mannheim; died 2006 in Mannheim; full name: Ewald Maria) - http://d-nb.info/gnd/120516446
found: Universität Heidelberg, Institut für Europäische Kunstgeschichte website, viewed January 8, 2020:Nachrufe von Golo Maurer und Walter Berschin (Prof. Ewald M. Vetter; Ewald Maria Vetter; born May 3, 1922; died November 23, 2006; obtained his doctorate at Heidelberg in 1954; after a few years in Aachen, he joined the faculty at Heidelberg in 1959) - https://www.uni-heidelberg.de/fakultaeten/philosophie/zegk/iek/mitarbeiter_vetter.html