Cita APA (7th ed.)

Ullmann, E. (1979). Albrecht Dürer. Seemann.

Cita Chicago (17th ed.)

Ullmann, Ernst. Albrecht Dürer. Leipzig: Seemann, 1979.

Cita MLA (8th ed.)

Ullmann, Ernst. Albrecht Dürer. Seemann, 1979.