| 1 | http://kr.blog.yahoo.com/wisecamp06j139 |
| 2 | http://www.cosguide.com/ |
| 3 | 유영준, '동굴자원의 체험관광 활성화 방안', 관광연구논문, 제14호, pp. 119-140, 2002 |
| 4 | http://www.doukutu.co.jp/sc-contents.html |
| 5 | http://www.jsjland.co.kr/ |
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