000 00277nam a2200097Ia 4500
008 120224s9999 xx 000 0 und d
082 _a300.72
_bBLA
100 _aBlack, James A.
245 _aMethods and issues in social research
260 _bJohn Wiley
_aNew York
_c1976
999 _c139753
_d139753