Department of International Relations2024-11-0920181537-592710.1017/S1537592718001676http://dx.doi.org/10.1017/S1537592718001676https://hdl.handle.net/20.500.14288/13623N/APolitical scienceThe puzzle of peace: the evolution of peace in the international systemBook Review1541-0986442358900081Q1835