ANWB-Hauptverwaltung
- Designed shells and Research Work by Prof. Haas. In: Journal of the International Association for Shell and Spatial Structures, n. 36 (Dezember 1968), S. 11-16. (1968):
- Space Structures in the Netherlands Since 1966. Vorgetragen bei: Second International Conference on Space Structures, University of Surrey, Guildford (UK), 09.1975, S. 231. (1975):