000 00500nam a2200193 4500
001 15901/72
005 20130515015543.0
008 111112s9999 xx 000 0 und d
020 _a13-891333-1
020 _ahard cover
082 0 0 _a371. 1 ger
100 1 _a"gerlach, vernon s. "
245 1 0 _ateaching and media:a systematic approach:
_b/
_c vernon.s. gerlach
250 _a1 ed.
260 _ausa :
_bprentice hall
_c1971.
300 _a"xiii, 392p.;
_c23 cm."
504 _a
650 0 _a
_x
999 _c52009
_d52009