G. Herzwurm, and U. Müller. Studien zur Systementwicklung des Lehrstuhls für Wirtschaftsinformatik der Universität zu Köln Köln, Zweite edition, (1997)
G. Herzwurm, and S. Schockert. Proceedings of the Fifth International Symposium on Quality Function Deployment and the First Brazilian Conference on Management of Product Development, August 24-26, 1999 in Belo Horizonte, Brazil., page 83-91. (1999)
G. Herzwurm, S. Schockert, and U. Dowie. Proceedings of 1st Turkish National Symposium on Quality Function Deployment in Izmir, Turkey, 17.-19.4.2002., (April 2002)