Singapore's tourism industry : How its strengths offset economic, social and environmental challenges / Rex S. Toh, Habibullah Khan, Karen Lim
A travel balance approach for examining tourism area life cylcles: the case of Singapore / Rex S. Toh, Habibullah Khan, Ai-Jin Koh
Tourism and trade: cointegration and granger causality tests / Habibullah Khan, Rex S. Toh, Lyndon Chua