(1989). Educational technology research and development: ETR & D. Association for Educational Communications and Technology.
Чикаго-гийн эшлэл (17 дахь хэвлэлт)Educational Technology Research and Development: ETR & D. Washington, D.C.: Association for Educational Communications and Technology, 1989.
MLA -ийн эшлэл (9 дэх хэвлэлт)Educational Technology Research and Development: ETR & D. Association for Educational Communications and Technology, 1989.
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