sack, k. (1964). special conceptions of socialist economy. the institute of national planning.
Čikaški stil citiranja (17. izdanje)sack, kurt. Special Conceptions of Socialist Economy. cairo: the institute of national planning, 1964.
MLA način citiranja (9. izdanje)sack, kurt. Special Conceptions of Socialist Economy. the institute of national planning, 1964.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.