APA Edition Citation

Knorr, K., & Verba, S. (1961). International System: Theoretical essays.

Chicago Edition Citation

Knorr, Klaus, and Sidney Verba. International System: Theoretical Essays. 1961.

MLA Edition Citation

Knorr, Klaus, and Sidney Verba. International System: Theoretical Essays. 1961.

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