The international system : theoretical essays

MLA

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

APA

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

Chicago

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