@Article{ruhe2009, author = "Ruhe, Valerie and Zumbo, Bruno D.", title = "Evaluation in Distance Education and E-Learning", journal = "eleed", year = "2009", volume = "5", number = "1", keywords = "distance education; e-learning; evaluation", issn = "1860-7470", url = "http://nbn-resolving.de/urn:nbn:de:0009-5-17609" }