Cita APA (7th ed.)
Keen, M., & Strand, J. (2006). Indirect taxes on international aviation. International Monetary Fund.
Cita Chicago (17th ed.)
Keen, Michael, i Jon Strand. Indirect Taxes on International Aviation. [Washington, D.C.?]: International Monetary Fund, 2006.
Cita MLA (9th ed.)
Keen, Michael, i Jon Strand. Indirect Taxes on International Aviation. International Monetary Fund, 2006.
Atenció: Aquestes cites poden no estar 100% correctes.