^TYPOGRAPHY – An Encyclopedic Survey of Type Design and Techniques Throughout History by Friedrich Friedl, Nicolaus Ott (Editor), Bernard Stein, published by Könemann Verlagsgesellschaft mbH
^Fiedl, Frederich, Nicholas Ott and Bernard Stein. Typography: An Encyclopedic Survey of Type Design and Techniques Through History. Black Dog & Leventhal: 1998. (ردمك 1-57912-023-7), p. 151.
