Knorr, K. E. (1969). Contending approaches to international politics. Princeton University Press.
Lua i Stíl Chicago (17ú heag.)Knorr, Klaus Eugen. Contending Approaches to International Politics. Princeton, N.J: Princeton University Press, 1969.
Lua MLA (9ú heag.)Knorr, Klaus Eugen. Contending Approaches to International Politics. Princeton University Press, 1969.
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