Gray, G. E., & Hoel, L. A. (1979). Public transportation: Planning, operations and management (1a ed.). Prentice-Hall International.
Cita Chicago Style (17a ed.)Gray, George E., y Lester A. Hoel. Public Transportation: Planning, Operations and Management. 1a ed. New Jersey: Prentice-Hall International, 1979.
Cita MLA (9a ed.)Gray, George E., y Lester A. Hoel. Public Transportation: Planning, Operations and Management. 1a ed. Prentice-Hall International, 1979.
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