APA (7th ed.) Citation

Salomon, I., Bovy, P. H. L., & Orfeuil, J. (1993). A billion trips a day: Tradition and transition in European travel patterns. Kluwer Academic.

Chicago Style (17th ed.) Citation

Salomon, Ilan, Piet H. L. Bovy, and Jean-Pierre Orfeuil. A Billion Trips a Day: Tradition and Transition in European Travel Patterns. Dordrecht, Boston: Kluwer Academic, 1993.

MLA (9th ed.) Citation

Salomon, Ilan, et al. A Billion Trips a Day: Tradition and Transition in European Travel Patterns. Kluwer Academic, 1993.