00703nam#a2200229uc#4500001000800000005001700008020002500025084000700050100003800057245011600095250001300211264005200224300003900276650002100315650001300336650001100349650001100360650001600371700004000387700002500427700002100452006667220260731222638.0  a0-13-248731-4c41,99  aPn1 aSimonson, MichaeleVerfasser4aut  aTeaching and learning at a distancebFoundations of distance educationcMichael Simonson, Sharon E. Smaldino...  a5. Aufl. 1aUpper Saddle River, NJbPearson Educationc2011  aXXIV; 383 S. : Ill., graph. Darst. 4aOnline Education 4aInternet 4aLehren 4aLernen 4aFernstudium1 aSmaldino, Sharon E.eVerfasser4aut1 aAlbright, Michael J.1 aZvacek, Susan M.