1. Ramez Elmasri and Shamkant B. Navathe, Fundamentals of Database Systems, Addison-Wesley, 1994
2. Peter Rob and Carlos Coronel, Database Systems: Design, Implementation, and Management, International Thomson Publishing, 1993
3. ChangHwa Kim, DooKwon Baik, “REA:Restricted EA model,” Proceeding of the KISS Spring Conference, Korea Information Science Society, 16(1):119–122, 1989
4. ChangHwa Kim, DooKwon Baik, “REAPS:Restricted EA modeling Prolog System,” Journal of the Korea Information Science Society, 17(5):502–519, September 1990
5. Lecture Note;D. Baik,2001