Lua APA (7ú heag.)

Wulf, L. d., & .Sokol, J. B. (2004). Customs modernization initiatives: Case studies. World Bank.

Lua i Stíl Chicago (17ú heag.)

Wulf, Luc de, agus Jose B. .Sokol. Customs Modernization Initiatives: Case Studies. Washington, DC: World Bank, 2004.

Lua MLA (9ú heag.)

Wulf, Luc de, agus Jose B. .Sokol. Customs Modernization Initiatives: Case Studies. World Bank, 2004.

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