APA (7th ed.) Zitazioa
ebrary, Inc, Wulf, L. d., & Sokol, J. B. (2004). Customs modernization initiatives: Case studies. World Bank.
Chicago Style (17th ed.) Zitazioa
ebrary, Inc, Luc de Wulf, eta José B. Sokol. Customs Modernization Initiatives: Case Studies. Washington, DC: World Bank, 2004.
MLA (9th ed.) Zitazioa
ebrary, Inc, et al. Customs Modernization Initiatives: Case Studies. World Bank, 2004.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.