Schutt-Kehm, E. Exlibris-Katalog des Gutenberg-Museums Vol. 1 and 2.

Wiesbaden, Claus Wittal, 1985-2003, 2 parts in 3 vols., 464; 718,(2); 736p., num. ills., orig. (unif.) cl., large 8vo. Wittal, C. Eignerverzeichnis zum Exlibris-Katalog des Gutenberg-Museums 1. Teil. Ibid., idem, 1985, 65p., orig. wr. - AND 2 others in 5 vols., i.a. K. WITTE, Exlibris Monogrammlexicon (Frederikshavn, 1984-1993, 4 vols., orig. unif. wr. Contains thousands of monograms).