Wulf, L. d., & .Sokol, J. B. (2004). Customs modernization initiatives: Case studies. World Bank.
Citação norma ChicagoWulf, Luc de, and Jose B. .Sokol. Customs Modernization Initiatives: Case Studies. Washington, DC: World Bank, 2004.
Citação norma MLAWulf, Luc de, and Jose B. .Sokol. Customs Modernization Initiatives: Case Studies. World Bank, 2004.