Cita APA

Walters, A. A., & Walters, A. A. (1979). Costs and scale of bus services. Washington: World Bank.

Citación estilo Chicago

Walters, A. A., y A. A. Walters. Costs and Scale of Bus Services. Washington: World Bank, 1979.

Cita MLA

Walters, A. A., y A. A. Walters. Costs and Scale of Bus Services. Washington: World Bank, 1979.