A. Alborz, D. Pearson, P. Farrell, and A. Howes. 1702T. EPPI-Centre, Social Science Research Unit, Institute of Education, University of London, London, (2009)
S. Alexander, and J. Hedberg. Proceedings of the IFIP TC3/WG3.2 Working Conference on the Seign, Implementation and Evaluation of Interactive Multimedia in University Settings, page 233--244. New York, NY, USA, Elsevier Science Inc., (1994)
R. Allen, and A. Vignoles. DoQSS Working Papers 0904 Department of Quantitative Social Science - Institute of Education, University of London, London, (2009)