Bailey, W. (2005) What is adl scorm? http://zope.cetis.ac.uk/lib/media/WhatIsScorm2_web.pdf
 El-Gazzar, A.-L.E. (2002) Effectiveness of using multimedia computer assisted instruction on acquision of some levels of learning of scientific concepts according to Frayer’s Model of Concepts’ evaluation. Journal of Education, Scientific Refereed Journal, Faculty of Education, Al-Azhar University, Cairo, 155, 37-83.
 Frosch-Wilke, D. (2004) An extended and adaptable information model for learning objects. Proceedings of IEEE International Conference on Advanced Learning Technologies (ICALT'04), 30 August-1 September 2004, 166-170.
 Kay, H. and Knaack, L. (2008) Examining the impact of learning objects in secondary school. http://dx.doi.org/10.1111/j.1365- 2729.2008.00278.x
 Nouby, A.M. (2009) The effectiveness of the design of learning objects for blended learning on achievement and interests among students of the faculty of medicine at the Arabian Gulf University. Journal of Instructional Technology, Egyptian Association of Educational Technology, 4, 153-156.
 Reece, A. (2009) A reusable learning object design model for elementary mathematics. PhD Thesis, Capella University, Florida, USA. http://www.e-novalia.com/materiales/RLOW__07_03.pdf
 Stamey, J. (2006) A comparison of the performance of undergraduate statistics students using intelligent learning objects versus those receiving traditional classroom instruction. PhD Thesis, North Carolina State University, USA. http://search.proquest.com/.(3,233,063)