Bull, A. (1991). The economics of travel and tourism. John Wiley & Sons.
Cita Chicago Style (17a ed.)Bull, Adrian. The Economics of Travel and Tourism. New York: John Wiley & Sons, 1991.
Cita MLA (8a ed.)Bull, Adrian. The Economics of Travel and Tourism. John Wiley & Sons, 1991.
Precaución: Estas citas no son 100% exactas.