(1989). Educational technology research and development: ETR & D. Association for Educational Communications and Technology.
Chicago-Zitierstil (17. Ausg.)Educational Technology Research and Development: ETR & D. Washington, D.C.: Association for Educational Communications and Technology, 1989.
MLA-Zitierstil (9. Ausg.)Educational Technology Research and Development: ETR & D. Association for Educational Communications and Technology, 1989.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.