Sorgenfrei, C. (2011). Optimum currency areas: A monetary union for southern Africa. Diplomica Verlag.
Chicago-čujuhus (17. p.)Sorgenfrei, Christian. Optimum Currency Areas: A Monetary Union for Southern Africa. Hamburg: Diplomica Verlag, 2011.
MLA-čujuhus (9. p.)Sorgenfrei, Christian. Optimum Currency Areas: A Monetary Union for Southern Africa. Diplomica Verlag, 2011.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.