Ball, A. R. (1988). Modern politics and government (7th ed.). Palgrave MacMillan.
Chicago Style (17th ed.) ZitazioaBall, Alan R. Modern Politics and Government. 7th ed. New York: Palgrave MacMillan, 1988.
MLA (9th ed.) ZitazioaBall, Alan R. Modern Politics and Government. 7th ed. Palgrave MacMillan, 1988.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.