00441nam a2200157Ia 4500008004100000020001800041082001500059100001700074245003400091250000800125260002800133300000800161942000700169952009000176999001700266190710s9999    xx            000 0 und d  a0-415-36878-2  a370.78 C66  aCohen, Louis 0aResearch methods in education  a6th  aLondonbRoutledgec2007  a638  cBK  00104070aRIEBPLbRIEBPLd2019-07-10l0o370.78 C66p60128r2019-07-10 00:00:00yBK  c27579d27579