Li, Fengsen. “Retracted: How to Solve the Moral Dilemma of Helping a Fallen Old Man: An Economic Point of View”. Business, Management and Economics Engineering 11, no. 2 (September 13, 2013): 209-223. Accessed December 2, 2021. https://journals.vgtu.lt/index.php/BME/article/view/3652.