@book { 6180, title = {Personal Learning Environments in der Hochschullehre}, year = {2009}, publisher = {H{\"u}lsbusch Verlag}, organization = {H{\"u}lsbusch Verlag}, isbn = {3-940317-40-3}, url = {http://www.vwh-verlag.de/vwh/?p=345}, author = {Kaliva, Elisabeth} }