Michael Molenda: Historical Foundations. W: J. Michael Spector, M. David Merrill, Jeroen van Merriënboer, Marcy P. Driscoll (red.): Handbook of Research on Educational Communications and Technology: A Project of the Association for Educational Communications and Technology. Wyd. 3. New York–Abingdon: Lawrence Erlbaum Associates, 2008, s. 10. DOI: 10.4324/9780203880869. ISBN 978-1-135-59691-0. ISBN 978-0-203-88086-9. (ang.).
doi.org
Michael Molenda: Historical Foundations. W: J. Michael Spector, M. David Merrill, Jeroen van Merriënboer, Marcy P. Driscoll (red.): Handbook of Research on Educational Communications and Technology: A Project of the Association for Educational Communications and Technology. Wyd. 3. New York–Abingdon: Lawrence Erlbaum Associates, 2008, s. 10. DOI: 10.4324/9780203880869. ISBN 978-1-135-59691-0. ISBN 978-0-203-88086-9. (ang.).