1. Korea National Statistical Office: 2011 report on the GDP and GNI survey. [http://kosis.kr/statisticsList/statisticsList_01List.jsp?vwcd=MT_ZTITLE&parmTabId=M_01_01], Korea National Statistical Office: 2011 report on the GDP and GNI survey. [ http://kosis.kr/statisticsList/statisticsList_01List.jsp?vwcd=MT_ZTITLE&parmTabId=M_01_01 ]
2. Korea National Statistical Office: 2011 report on the workforce survey. [http://kosis.kr/statisticsList/statisticsList_01List.jsp?vwcd=MT_OTITLE&parmTabId=M_01_02], Korea National Statistical Office: 2011 report on the workforce survey. [ http://kosis.kr/statisticsList/statisticsList_01List.jsp?vwcd=MT_OTITLE&parmTabId=M_01_02 ]
3. Ministry of Employment and Labor: Report on the industrial disaster occurrences. [http://www.moel.go.kr/view.jsp?cate=3&sec=3&smenu=4&smode=2], Ministry of Employment and Labor: Report on the industrial disaster occurrences. [ http://www.moel.go.kr/view.jsp?cate=3&sec=3&smenu=4&smode=2 ]
4. Won YS, Park KH, Kim IW: Hotel Management. Daewang Pub Seoul, Seoul; 2011.
5. Lee SH: A Study on the job Stress of Hotel Employees: Focused on the Deluxe Hotel in Seoul. Unpublished Doctoral Dissertation. Kyonggi Univ Seoul, Seoul; 2002.