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| 100 | _aHolmberg, Borje | ||
| 020 | _a0-415-00996-0 | ||
| 365 | _b840 | ||
| 942 | _cBK | ||
| 654 | _a | ||
| 245 | _aTheory and practice of distance education | ||
| 260 |
_aLondon _bRoutledge _c1989 |
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| 082 | _a374 | ||
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_bHb _c22cm _axii,252 |
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| 041 | _aeng | ||