Buzan,B. (2000). International systems in world history. OUP.
Chicago-čujuhus (17. p.)Buzan,B. International Systems in World History. New York: OUP, 2000.
MLA-čujuhus (9. p.)Buzan,B. International Systems in World History. OUP, 2000.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.