Cita APA (7a ed.)

Ko, J. T. G. (2001). Assessing progress of tourism sustainability. [s.n.].

Cita Chicago Style (17a ed.)

Ko, James T. G. Assessing Progress of Tourism Sustainability. [S.l.]: [s.n.], 2001.

Cita MLA (9a ed.)

Ko, James T. G. Assessing Progress of Tourism Sustainability. [s.n.], 2001.