APA (7th ed.) Zitazioa
Sorgenfrei, C. (2011). Optimum currency areas: A monetary union for southern Africa. Diplomica Verlag.
Chicago Style (17th ed.) Zitazioa
Sorgenfrei, Christian. Optimum Currency Areas: A Monetary Union for Southern Africa. Hamburg: Diplomica Verlag, 2011.
MLA (9th ed.) Zitazioa
Sorgenfrei, Christian. Optimum Currency Areas: A Monetary Union for Southern Africa. Diplomica Verlag, 2011.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.