Não informado. (1989). Educational Technology Research and Development. Association for Educational Communications and Technology.
Chicago-Zitierstil (17. Ausg.)Não informado. Educational Technology Research and Development. Washington: Association for Educational Communications and Technology, 1989.
MLA-Zitierstil (8. Ausg.)Não informado. Educational Technology Research and Development. Association for Educational Communications and Technology, 1989.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.