Calisir, F. , Gumussoy, C. , Bayraktaroglu, A. , Saygivar, E.. "Usability and Functionality: A Comparison of Key Project Personnel's and Potential Users' Evaluations". World Academy of Science, Engineering and Technology, Open Science Index 59, International Journal of Economics and Management Engineering, (2011), 5(11), 1317 - 1321.