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Williamson และผู้แต่งคนอื่นๆ. 1993. Tourist development and capitalist transformation on Koh Samui. Department of Geography, University of Sydney;
Williamson และผู้แต่งคนอื่นๆ. (1993) Tourist development and capitalist transformation on Koh Samui . University of Sydney/Sydney.
Williamson และผู้แต่งคนอื่นๆ. Tourist development and capitalist transformation on Koh Samui. . Sydney:University of Sydney, 1993.
Williamson และผู้แต่งคนอื่นๆ. (1993) Tourist development and capitalist transformation on Koh Samui . University of Sydney/Sydney.