Bowersox, D. J., Calabro, P. J., & Wagenheim, G. D. (1981). Introduction to Transportation. Macmillan Publishing Co., Inc.
Cita Chicago (17th ed.)Bowersox, Donald J., Pat J. Calabro, i George D. Wagenheim. Introduction to Transportation. New York: Macmillan Publishing Co., Inc, 1981.
Cita MLA (9th ed.)Bowersox, Donald J., et al. Introduction to Transportation. Macmillan Publishing Co., Inc, 1981.
Atenció: Aquestes cites poden no estar 100% correctes.