Siu, R. C. S. (2019). Economic principles for the hospitality industry (First edition.). Routledge.
Citazione stile Chigago Style (17a edizione)Siu, Ricardo Chi Sen. Economic Principles for the Hospitality Industry. First edition. Abingdon, Oxon: Routledge, 2019.
Citatione MLA (9a ed.)Siu, Ricardo Chi Sen. Economic Principles for the Hospitality Industry. First edition. Routledge, 2019.