Asif Khan, M., R. Ur Rheman, M. Akram Nassed, and M. Alharti. “Two Sides of the Coin (Agents or Stewards)”. Journal of the University of Zulia , Vol. 10, no. 26, Oct. 2019, pp. 3-36, https://produccioncientificaluz.org/index.php/rluz/article/view/29659.