| 1 | http://terms.naver.com/ |
| 2 | Park Sung -Yong(2011) Analysis of the Determinants of Subway Customer Satisfaction -A Case Study of the Seoul Subway Lines-, Master of Business Administration, Seoul National University of Science and Technology Graduate School of Industry. pp. 1-2. |
| 3 | Seoul Metro (2008) Manual operation work plan, p. 9, P. 202. |
| 4 | Lee Sang-guk, kim yul-seong, lee wong-yu(2007), Activated through the use of Busan Subway Research Analysis, Pusan Development institute, pp. 2-3. |
| 5 | http://www.seoulmetro.co.kr |
| 6 | Seo jeong-sik(2014) 2014 Transportation planning, Seoul Metro, p. 8, p. 145, p. 194. |
| 7 | Korea Railroad(2011) Urban rail Systems General, p. 7. |
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