APA-viite (7. p.)
ebrary, Inc, & Noumba Um, P. (2004). A model for calculating interconnection costs in telecommunications. World Bank.
Chicago-viite (17. p.)
ebrary, Inc, ja Paul Noumba Um. A Model for Calculating Interconnection Costs in Telecommunications. Washington, DC: World Bank, 2004.
MLA-viite (9. p.)
ebrary, Inc, ja Paul Noumba Um. A Model for Calculating Interconnection Costs in Telecommunications. World Bank, 2004.
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