teaching and media:a systematic approach: / vernon.s. gerlach
By: "gerlach, vernon s. ".
Material type:
BookPublisher: usa : prentice hall 1971Edition: 1 ed.Description: "xiii, 392p.; 23 cm.".ISBN: 13-891333-1; hard cover.Subject(s): --DDC classification: 371. 1 ger
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