Media type: E-Article Title: Handbook of research on learning design and learning objects: issues, applications and technologies Contributor: Derntl, Michael Published: Informa UK Limited, 2009 Published in: Distance Education, 30 (2009) 2, Seite 277-284 Language: English DOI: 10.1080/01587910903023231 ISSN: 1475-0198; 0158-7919 Keywords: Education Origination: Footnote: