000 00273nam a2200109Ia 4500
008 170711s9999 xx 000 0 und d
050 _a300 Y51
100 _a"Yin, Robert K."
245 0 _aCase study research: design and methods
260 _c2003
942 _2lcc
_cBK
_kCirc.
999 _c20207
_d20207