00311nam a2200121Ia 45000030006000000080041000060400015000471000041000622450035001032600022001385460012001600050017001720STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aHubert Blaclock, M.; Ann Blalock, B.  aMethodology in social research  bMcgraw hillc1968  aEnglish20220125170606.0