Investigation of need and adjustment [German]https://www.upress.umn.edu/test-division/bibliography/1970-1979/1972/ingenkamp_investigation_1972https://www.upress.umn.edu/logo.png
K. Ingenkamp
(1972)
Investigation of need and adjustment [German]
In: Handbuch der unterrichtsforschung, J. Beltz, Weinheim.