Cita APA (7th ed.)

Bechtler, C., & Szeemann, H. (1992). Willi Kopf: Skulpturen ; 1985 - 1991 / Cristina Bechtler. Ed. Cantz.

Cita Chicago (17th ed.)

Bechtler, Cristina, i Harald Szeemann. Willi Kopf: Skulpturen ; 1985 - 1991 / Cristina Bechtler. Ostfildern-Ruit: Ed. Cantz, 1992.

Cita MLA (8th ed.)

Bechtler, Cristina, i Harald Szeemann. Willi Kopf: Skulpturen ; 1985 - 1991 / Cristina Bechtler. Ed. Cantz, 1992.