Wulf, L. d., & .Sokol, J. B. (2004). Customs modernization initiatives: Case studies. World Bank.
Tohutoru Kātū Chicago (17th ed.)Wulf, Luc de, me Jose B. .Sokol. Customs Modernization Initiatives: Case Studies. Washington, DC: World Bank, 2004.
Tohutoro MLA (9th ed.)Wulf, Luc de, me Jose B. .Sokol. Customs Modernization Initiatives: Case Studies. World Bank, 2004.