Cita APA (7th ed.)
ebrary, Inc, Butler, R., & Russell, R. A. (2010). Giants of tourism. CABI.
Cita Chicago (17th ed.)
ebrary, Inc, Richard Butler, i Roslyn A. Russell. Giants of Tourism. Wallingford, Oxfordshire ; Cambridge, MA: CABI, 2010.
Cita MLA (9th ed.)
ebrary, Inc, et al. Giants of Tourism. CABI, 2010.
Atenció: Aquestes cites poden no estar 100% correctes.