APA (7th ed.) Citation

Knorr, K. E., & Verba, S. (1961). The international system: Theoretical essays. Univ. Press.

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

Knorr, Klaus Eugen, and Sidney Verba. The International System: Theoretical Essays. Univ. Press, 1961.

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