Cita APA (7a ed.)
Churchman, C. W., Protzen, J., & Webber, M. M. (Winter2007). In Memoriam: Horst W. J. Rittel. Design Issues, 23(1), 89-92.
Cita Chicago Style (17a ed.)
Churchman, C. West, Jean-Pierre Protzen, y Melvin M. Webber. "In Memoriam: Horst W. J. Rittel." Design Issues 23, no. 1 (Winter2007): 89-92.
Cita MLA (9a ed.)
Churchman, C. West, et al. "In Memoriam: Horst W. J. Rittel." Design Issues, vol. 23, no. 1, Winter2007, pp. 89-92.
Precaución: Estas citas no son 100% exactas.