Rasika Parge, Prof. M.M.More, Saurabh Amrutkar, Swati Daundkar, Rohit Jagtap,. 2014. “A Secured and Controlled Billing System by Agent for Cloud Computing Environment”. International Journal of Engineering and Computer Science 3 (11). india. http://ijecs.in/index.php/ijecs/article/view/2497.