Cita APA

Lewis, D. (1984). Pencil drawing techniques. Watson-Guptill Publications.

Citación estilo Chicago

Lewis, David. Pencil Drawing Techniques. New York: Watson-Guptill Publications, 1984.

Cita MLA

Lewis, David. Pencil Drawing Techniques. Watson-Guptill Publications, 1984.

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