Douglass, Ralph. Calligraphic lettering with wide pen & brush. - [3d ed., rev. & enl.] - New York Watson-Guptill Publications [1977, c1967] - 111 p. illus. Bibliography: p. 65-66. LCCN: evl00000087 Subjects--Topical Terms: Lettering. LC Class. No.: NK3600 / .D68 1967 Dewey Class. No.: 741