Cita APA (7a ed.)

Protzen, J., & Harris, D. J. (2010). The Universe of Design: Horst Rittel's Theories of Design and Planning. Taylor & Francis.

Cita Chicago Style (17a ed.)

Protzen, Jean-Pierre, y David J. Harris. The Universe of Design: Horst Rittel's Theories of Design and Planning. Hoboken: Taylor & Francis, 2010.

Cita MLA (8a ed.)

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