Hawkins, D. E., Ritchie, J. B., Go, F., & Frechtling, D. C. (1991). World travel and tourism review: Indicators, trends and forecasts. CAB International.
Cita Chicago Style (17a ed.)Hawkins, Donald E., J.R. Brent Ritchie, Frank Go, y Douglas C. Frechtling. World Travel and Tourism Review: Indicators, Trends and Forecasts. Oxford: CAB International, 1991.
Cita MLA (8a ed.)Hawkins, Donald E., et al. World Travel and Tourism Review: Indicators, Trends and Forecasts. CAB International, 1991.
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