APA (7th ed.) Citation

Wettengl, K., & Grothe, N. (2008). Otto Piene: Spectrum.

Chicago Style (17th ed.) Citation

Wettengl, Kurt, and Nicole Grothe. Otto Piene: Spectrum. Dortmund, 2008.

MLA (9th ed.) Citation

Wettengl, Kurt, and Nicole Grothe. Otto Piene: Spectrum. 2008.

Warning: These citations may not always be 100% accurate.