Authors
Johannes Kingma
Dept. of Psychology University of Alberta Edmonton, Alberta T6G 2E9
Kees P. Van Den Bos
Vakgroep Orthopedagogiek Rijks Universileit Groningen Oude Boteringestraat I 9712 GA Groningen

© 1987 Johannes Kingma, Kees P. Van Den Bos, published by Ubiquity Press
This work is licensed under the Creative Commons Attribution 4.0 License.