Cita APA (7a ed.)

Walker, R., & Harding, K. (2007). Tourism 2 Class CD. Oxford University.

Cita Chicago Style (17a ed.)

Walker, Robin, y Keith Harding. Tourism 2 Class CD. Reino Unido: Oxford University, 2007.

Cita MLA (8a ed.)

Walker, Robin, y Keith Harding. Tourism 2 Class CD. Oxford University, 2007.