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| 020 | _a0-02-35020-0 | ||
| 020 | _ahard cover | ||
| 082 | 0 | 0 | _a371. 307 8 hei |
| 100 | 1 | _a"heinich, robert . " | |
| 245 | 1 | 0 |
_ainstructional media: _b/ _c robert.. heinich |
| 250 | _a3 ed. | ||
| 260 |
_ausa : _bmacmillan _c1989. |
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| 300 |
_a"xv, 455p.; _c28 cm." |
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| 504 | _a | ||
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_aeducational technology _xaudio-visual education |
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