Cita APA (7a ed.)

Röttger, E., & Klante, D. (1968). Creative drawing: Point and line. Reinhold Book Corporation.

Cita Chicago Style (17a ed.)

Röttger, Ernst, y Dieter Klante. Creative Drawing: Point and Line. New York; London: Reinhold Book Corporation, 1968.

Cita MLA (9a ed.)

Röttger, Ernst, y Dieter Klante. Creative Drawing: Point and Line. Reinhold Book Corporation, 1968.