(1989). Educational technology research and development: ETR & D. Association for Educational Communications and Technology.
Chicago-referens (17:e uppl.)Educational Technology Research and Development: ETR & D. Washington, D.C.: Association for Educational Communications and Technology, 1989.
MLA-referens (9:e uppl.)Educational Technology Research and Development: ETR & D. Association for Educational Communications and Technology, 1989.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.