Cita APA (7th ed.)

Sieber-Albers, A., & Ungers, S. (1999). O.M. Ungers: Zwischenräume. Hatje Cantz.

Cita Chicago (17th ed.)

Sieber-Albers, Anja, i Sophia Ungers. O.M. Ungers: Zwischenräume. Ostfildern-Ruit: Hatje Cantz, 1999.

Cita MLA (8th ed.)

Sieber-Albers, Anja, i Sophia Ungers. O.M. Ungers: Zwischenräume. Hatje Cantz, 1999.