Siu, R. C. S. (2019). Economic principles for the hospitality industry (First edition.). Routledge.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSiu, Ricardo Chi Sen. Economic Principles for the Hospitality Industry. First edition. Abingdon, Oxon: Routledge, 2019.
एमएलए (9वां संस्करण) प्रशस्ति पत्रSiu, Ricardo Chi Sen. Economic Principles for the Hospitality Industry. First edition. Routledge, 2019.
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