00389nam a2200133Ia 4500003000400000008004100004020002700045040000800072100002000080245010100100260002800201300001400229365001200243LDD181029s9999    xx            000 0 und d  a9780805845778cP 50.99  cLDD  aDuffy, Thomas M 0aLearner-Centered Theory and Practice in Distance Educatio; cases from higher educThomas M Duffy  aLondonbRoutledgec2015  axix,453p.  bP 50.99