APA aipamena

Protzen, J., & Harris, D. J. (2010). The universe of design: Horst Rittel's theories of design and planning. Routledge.

Chicago Style aipamena

Protzen, Jean-Pierre, and David J. Harris. The Universe of Design: Horst Rittel's Theories of Design and Planning. Oxon [England], New York, N.Y: Routledge, 2010.

MLA aipamena

Protzen, Jean-Pierre, and David J. Harris. The Universe of Design: Horst Rittel's Theories of Design and Planning. Routledge, 2010.