00302nam a2200109Ia 4500008004100000020001800041082001500059100001900074245005500093260003600148300000800184190710s9999    xx            000 0 und d  a0-8039-5892-7  a370.78 V46  aVaughn, Sharon 0aFocus group interviews in education and psychology  aLondonbSage Publicationsc1996  a173