Cita APA (7a ed.)

Bull, A. (1991). The economics of travel and tourism. Pitman [etc.].

Cita Chicago Style (17a ed.)

Bull, Adrian. The Economics of Travel and Tourism. Melbourne [etc.]: Pitman [etc.], 1991.

Cita MLA (9a ed.)

Bull, Adrian. The Economics of Travel and Tourism. Pitman [etc.], 1991.