000 00271nam a2200109Ia 4500
008 190428s9999||||xx |||||||||||||| ||und||
020 _a0-335-00900-X
100 _aKassman, A.
_98630
245 _aKnowledge and belief
250 _b1973. 66
260 _bOpen university. Bucks
999 _c8621
_d8621