Não informado. (1989). Educational Technology Research and Development. Association for Educational Communications and Technology.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Educational Technology Research and Development. Washington: Association for Educational Communications and Technology, 1989.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Educational Technology Research and Development. Association for Educational Communications and Technology, 1989.
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