Johnson, K.; Hall, T.; O'Keeffe, D. (2005-11-01). "Generation of Quiz Objects (QO) with a Quiz Engine Developer (QED)". IEEE International Workshop on Wireless and Mobile Technologies in Education (WMTE'05). pp. 120–122. doi:10.1109/WMTE.2005.26. ISBN978-0-7695-2385-9. S2CID2136869.
Johnson, K.; Hall, T.; O'Keeffe, D. (2005-11-01). "Generation of Quiz Objects (QO) with a Quiz Engine Developer (QED)". IEEE International Workshop on Wireless and Mobile Technologies in Education (WMTE'05). pp. 120–122. doi:10.1109/WMTE.2005.26. ISBN978-0-7695-2385-9. S2CID2136869.