Valletti, T. M. (1999). The practice of access pricing: Telecommunications in the United Kingdom. World Bank.
Citazione stile Chigago Style (17a edizione)Valletti, Tommaso M. The Practice of Access Pricing: Telecommunications in the United Kingdom. Washington, D.C: World Bank, 1999.
Citatione MLA (9a ed.)Valletti, Tommaso M. The Practice of Access Pricing: Telecommunications in the United Kingdom. World Bank, 1999.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.