Singer, J. D. (1990). Models, methods, and progress in world politics: A peace research odyssey. Westview Press.
Lua i Stíl Chicago (17ú heag.)Singer, Joel David. Models, Methods, and Progress in World Politics: A Peace Research Odyssey. Boulder,CO: Westview Press, 1990.
Lua MLA (9ú heag.)Singer, Joel David. Models, Methods, and Progress in World Politics: A Peace Research Odyssey. Westview Press, 1990.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.