"gerlach, vernon s. "
teaching and media:a systematic approach: / vernon.s. gerlach - 1 ed. - usa : prentice hall 1971. - "xiii, 392p.; 23 cm."
13-891333-1 hard cover
--
371. 1 ger
teaching and media:a systematic approach: / vernon.s. gerlach - 1 ed. - usa : prentice hall 1971. - "xiii, 392p.; 23 cm."
13-891333-1 hard cover
--
371. 1 ger