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| Kearsley, Greg; Moore, Michael G. | Distance Education: A Systems View |
| Merrill, David M.; Harris, Philip A.; Spector, J. Michael; Driscoll, Marcy P. | Handbook of Research |
| Merrill, David M.; Twitchell, David | Instructional Design Theory |
| Moonen, Jef; Plomp, Tieerd | Eurit 86 |
| Reeves, Thomas C.; Hedberg, John G. | Interactive Learning Systems Evaluation |