[12] Robert Axelrod and Robert O. Keohane, "Achieving Cooperation under Anarchy: Strategies and Institutions," World Politics 38, no. 1 (October 1985): 226–54.
[12] Robert Axelrod and Robert O. Keohane, "Achieving Cooperation under Anarchy: Strategies and Institutions," World Politics 38, no. 1 (October 1985): 226–54.