Cita APA (7th ed.)
Keen, M., Kim, Y. K., & Varsano, R. (2006). The "flat tax(es)": Principles and evidence. International Monetary Fund, Fiscal Affairs Dept..
Cita Chicago (17th ed.)
Keen, Michael, Yitae Kevin Kim, i Ricardo Varsano. The "Flat Tax(es)": Principles and Evidence. Washington, D.C.: International Monetary Fund, Fiscal Affairs Dept., 2006.
Cita MLA (9th ed.)
Keen, Michael, et al. The "Flat Tax(es)": Principles and Evidence. International Monetary Fund, Fiscal Affairs Dept., 2006.
Atenció: Aquestes cites poden no estar 100% correctes.