00314nam a2200109Ia 4500008004100000020001800041082001400059100001600073245006500089260003300154300001700187250814s9999    xx            000 0 und d  a9780415690140  a371.1 HAT  aJohn Hattie 0aVisible Learning for Teachers: Maximizing Impact on Learning  aNew York�bRoutledgec2012  a286p.; 21cm.