Cita APA (7a ed.)

Guptill, A. L. (1937). Pen drawing. Watson-Guptill publ..

Cita Chicago Style (17a ed.)

Guptill, Arthur Leighton. Pen Drawing. New York: Watson-Guptill publ., 1937.

Cita MLA (9a ed.)

Guptill, Arthur Leighton. Pen Drawing. Watson-Guptill publ., 1937.