Cita APA (7th ed.)

Laffont, J., Estache, A., & Zhang, X. (2004). Universal service obligations in developing countries. World Bank.

Cita Chicago (17th ed.)

Laffont, Jean-Jacques, Antonio Estache, i Xinzhu Zhang. Universal Service Obligations in Developing Countries. Washington, D.C: World Bank, 2004.

Cita MLA (9th ed.)

Laffont, Jean-Jacques, et al. Universal Service Obligations in Developing Countries. World Bank, 2004.