00392nam a2200145Ia 450000500170000000800410001703700130005804000200007104100130009108400090010410000150011324500660012826000430019430000090023720250326141113.0250326s9999    xx            000 0 und d  aTextbook  aFMSLbengcFMSL  aeng2eng  qFMSL  aFowler F J 0aImproving survey questions: Design and evaluationcFowler F J  aLondonbLondon, Sage Publicationc1993  a166p