Wulf, L. d., & .Sokol, J. B. (2004). Customs modernization initiatives: Case studies. World Bank.
Chicago-čujuhus (17. p.)Wulf, Luc de, juo Jose B. .Sokol. Customs Modernization Initiatives: Case Studies. Washington, DC: World Bank, 2004.
MLA-čujuhus (9. p.)Wulf, Luc de, juo Jose B. .Sokol. Customs Modernization Initiatives: Case Studies. World Bank, 2004.
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