1. The implications of tipping for economics and management;Azar;International Journal of Social Economics,2003
2. Azar, O.H., 2003. Is Future Service a Reason for Tipping? Theory and Evidence. Working paper, Department of Economics, Northwestern University.
3. Azar, O.H., 2004a. The social norm of tipping: a review. Working paper, Department of Business Administration, School of Management, Ben Gurion University of the Negev.
4. What sustains social norms and how they evolve? The case of tipping;Azar;The Journal of Economic Behavior and Organization,2004
5. Tip payments and the quality of service;Ben-Zion,1977