Case Karl E. (2018). Principles of Economics (12th.). Pearson.
Chicago-čujuhus (17. p.)Case Karl E. Principles of Economics. 12th. Pearson, 2018.
MLA-čujuhus (9. p.)Case Karl E. Principles of Economics. 12th. Pearson, 2018.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.