APA-čujuhus (7. p.)
Keen, M., Kim, Y. K., & Varsano, R. (2006). The "flat tax(es)": Principles and evidence. International Monetary Fund, Fiscal Affairs Dept..
Chicago-čujuhus (17. p.)
Keen, Michael, Yitae Kevin Kim, juo Ricardo Varsano. The "Flat Tax(es)": Principles and Evidence. Washington, D.C.: International Monetary Fund, Fiscal Affairs Dept., 2006.
MLA-čujuhus (9. p.)
Keen, Michael, et al. The "Flat Tax(es)": Principles and Evidence. International Monetary Fund, Fiscal Affairs Dept., 2006.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.