References:
A Study of Educational Simulations Part II - Interface Design, W. K. Adams, S. Reid, R. LeMaster, S. B. McKagan, K. K. Perkins, M. Dubson and C. E. Wieman, Journal of Interactive Learning Research, 19(4), 551-577 , October 2008.
http://phet.colorado.edu/publications/PhET_Interviews_II.pdf
A Study of Educational Simulations Part I - Engagement and Learning, W. K. Adams, S. Reid, R. LeMaster, S. B. McKagan, K. K. Perkins, M. Dubson and C. E. Wieman, Journal of Interactive Learning Research, 19(3), 397-419 , July 2008.
http://phet.colorado.edu/publications/PhET_Interviews_I.pdf
Developing and Researching PhET simulations for Teaching Quantum Mechanics, S. B. McKagan, K. K. Perkins, M. Dubson, C. Malley, S. Reid, R. LeMaster, and C. E. Wieman, American Journal of Physics, 76, 406, May 2008.
http://www.colorado.edu/physics/EducationIssues/papers/QMsims.pdf