1. Bredies, K., & Wölfel, C. (forthcoming) Long live the late bloomers: Current state of design PhD in Germany. Design Issues.
2. Friedman, K., Love, T. & Côrte-Real, E (Eds.): WonderGround. Design Research Society International Conference 2006. Lisbon, Portugal: IADE 2006.
3. Rith, C. & Dubberly, H. (2007). Why Horst W. J. Rittel Matters. Design Issues, 23(1), 72–74.
4. Rittel, H. W. J. (1972). On the Planning Crisis: Systems Analysis of the ‘First and Second Generations’. Bedriftsøkonomen, 390–396.
5. Melles, G. & Wölfel, C. (2014). Postgraduate Design Education in Germany: motivations, understandings and experiences of graduates and enrolled students in Master’s and Doctoral Programs. Design Journal, 17(1).