APA (7th ed.) Citation

Knorr, K. E., & Verba, S. (1961). The international system, theoretical essays. Princeton University Press.

Chicago Style (17th ed.) Citation

Knorr, Klaus Eugen, and Sidney Verba. The International System, Theoretical Essays. Princeton, N.J.: Princeton University Press, 1961.

MLA (8th ed.) Citation

Knorr, Klaus Eugen, and Sidney Verba. The International System, Theoretical Essays. Princeton University Press, 1961.

Warning: These citations may not always be 100% accurate.