Naseer, Hafsa, et al. “Towards Software Testing As a Service for Software As a Service Based on Cloud Computing Model: Software Testing on Cloud Computing Model ”. Proceedings of the Pakistan Academy of Sciences: A. Physical and Computational Sciences, vol. 55, no. 4, Mar. 2021, pp. 1-8, http://ppaspk.org/index.php/PPAS-A/article/view/52.