Gwartney, J., & Lawson, R. (1997). Economic freedom of the world: 1997 annual report. Fraser Institute.
Citazione stile Chigago Style (17a edizione)Gwartney, James, e Robert Lawson. Economic Freedom of the World: 1997 Annual Report. [Vancouver, B.C.]: Fraser Institute, 1997.
Citatione MLA (9a ed.)Gwartney, James, e Robert Lawson. Economic Freedom of the World: 1997 Annual Report. Fraser Institute, 1997.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.