found: Staatliche Museen Preussischer Kulturbesitz. Kupferstichkabinett. Deutsche Zeichnungen des 18. Jahrhunderts, c1987:t.p. (Volker Manuth)
found: Example or alter ego, 2016:title page (edited by Volker Manuth, Rudie van Leeuwen, Jos Koldewij)
found: Radboud University, via WWW, 25 July 2017(Professor Volker Manuth is a professor of art history; his areas of interest include painting in northern and southern Netherlands, England, and German speaking countries)
found: DNB, July 26, 2017(Manuth, Volker, 1956-; male; Netherlands; art historian; specializes in Dutch art of the 16th/17th century)