Forsyth และผู้แต่งคนอื่นๆ. 1992. Environmental degradation and tourism in a Yao village of Northern Thailand. , University of London;

Forsyth และผู้แต่งคนอื่นๆ. Environmental degradation and tourism in a Yao village of Northern Thailand. . London:University of London, 1992.

Forsyth และผู้แต่งคนอื่นๆ. (1992) Environmental degradation and tourism in a Yao village of Northern Thailand . University of London/London.