APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (8th ed.) Citation

Guptill, Arthur L. Pen Drawing. Watson-Guptill, 1937.

Warning: These citations may not always be 100% accurate.