WASET
    Beata Czarnacka-Chrobot,  Factors of Effective Business Software Systems Development and Enhancement Projects Work Effort Estimation.   journal   = {International Journal of Computer and Systems Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2012, vol. 61(1). 39 - 46
    [viewed 07 May 2024]. Available from: https://publications.waset.org/pdf/4596.