Cita APA (7a ed.)

Noumba Um, P. (2004). A model for calculating interconnection costs in telecommunications. World Bank : PPIAF.

Cita Chicago Style (17a ed.)

Noumba Um, Paul. A Model for Calculating Interconnection Costs in Telecommunications. Washington, D.C.: World Bank : PPIAF, 2004.

Cita MLA (9a ed.)

Noumba Um, Paul. A Model for Calculating Interconnection Costs in Telecommunications. World Bank : PPIAF, 2004.