Wulf, L. d., & .Sokol, J. B. (2004). Customs modernization initiatives: Case studies. World Bank.
Style de citation Chicago (17e éd.)Wulf, Luc de, et Jose B. .Sokol. Customs Modernization Initiatives: Case Studies. Washington, DC: World Bank, 2004.
Style de citation MLA (9e éd.)Wulf, Luc de, et Jose B. .Sokol. Customs Modernization Initiatives: Case Studies. World Bank, 2004.