00338nam a22001217a 4500003000400000005001700004008004100021020001700062040000800079100001700087245007600104260003600180OSt20191002132005.0191002b        xxu||||| |||| 00| 0 eng d  a978159385872  cN/A  aRuhe Valerie  aEvaluation in distance education and e learning :bthe unfolding model.  aU.S.AbThe Guilford Pressc2009