APA

Banco Mundial, .Doing business 2008. Bogotá, Colombia : Mayol, 2007: .

Chicago

Banco Mundial, .Doing business 2008. Bogotá, Colombia : Mayol, 2007: .

Harvard

Banco Mundial, .Doing business 2008. Bogotá, Colombia : Mayol, 2007: .

MLA

Banco Mundial, .Bogotá, Colombia : Mayol, 2007: . .