Cita APA (7a ed.)

Hoel, L. A., & Gray, G. E. (1992). Public transportation (2nd ed.). Prentice-Hall.

Cita Chicago Style (17a ed.)

Hoel, Lester A., y George E. Gray. Public Transportation. 2nd ed. Englewood Cliffs, New Jersey: Prentice-Hall, 1992.

Cita MLA (9a ed.)

Hoel, Lester A., y George E. Gray. Public Transportation. 2nd ed. Prentice-Hall, 1992.