Cita APA (7a ed.)

Major, E., & Gradmann, E. (1940). Urs Graf. Holbein.

Cita Chicago Style (17a ed.)

Major, Emil, y Erwin Gradmann. Urs Graf. Basel: Holbein, 1940.

Cita MLA (9a ed.)

Major, Emil, y Erwin Gradmann. Urs Graf. Holbein, 1940.