Cleverdon, R. (1985). International business travel: A new megamarket. Economist Intelligence Unit.
Cita Chicago (17th ed.)Cleverdon, Robert. International Business Travel: A New Megamarket. London ; New York: Economist Intelligence Unit, 1985.
Cita MLA (8th ed.)Cleverdon, Robert. International Business Travel: A New Megamarket. Economist Intelligence Unit, 1985.
Atenció: Aquestes cites poden no estar 100% correctes.