Friedman, M.
1953. The methodology of positive economics. In Essays in positive economics, edited by M. Friedman. Chicago: University of Chicago Press.
2.
Musgrave, A.1981. “Unreal assumptions” in economic theory: The F-twist untwisted. Kyklos34:377-387.
3.
Tsebelis, G.
1990. Nested games: Rational choice in comparative politics. Berkeley: University of California Press.