Bowersox, D. J. (1981). Introduction to transportation. Macmillan.
Cita Chicago (17th ed.)Bowersox, Donald J. Introduction to Transportation. Macmillan, 1981.
Cita MLA (9th ed.)Bowersox, Donald J. Introduction to Transportation. Macmillan, 1981.
Atenció: Aquestes cites poden no estar 100% correctes.