Citazione Stile APA (7a Edizione)

Keen, M. (2007). VAT, Tariffs, and Withholding: Border Taxes and Informality in Developing Countries. International Monetary Fund.

Citazione stile Chigago Style (17a edizione)

Keen, Michael. VAT, Tariffs, and Withholding: Border Taxes and Informality in Developing Countries. Washington, D.C.: International Monetary Fund, 2007.

Citatione MLA (8a ed.)

Keen, Michael. VAT, Tariffs, and Withholding: Border Taxes and Informality in Developing Countries. International Monetary Fund, 2007.