1. KESA. A study on the policy for the development of the computer game industry. KESA, Seoul 1998
2. The White Paper on the Korean game industry. Korean PC Game Development Company Communication, Seoul, 1997.
3. Saaty TL. Decision making for leaders: the analytic hierarchy process for decisions in a complex world. RWP Publication, Pittsburgh PA, 1995
4. American Heritage Dictionary of English Language, Third Edition. Houghton Mifflin Co., New York, 1992
5. Crawford C Art of computer game design. McGraw-Hill, Osborne, 1984