J. M. Allbeck and N. I. Badler, Towards behavioural consistency in animated agents, proceedings of the IFIP TC5/WG5.10 DEFORM Workshop and AVATARS Workshop on Deformable Avatars: IFIP Conference Proceedings, pp.191-205, 2000.

A. L. Baylor, Agent-based learning environments for investigating teaching and learning, Journal of Educational Computing research, pp.249-270, 2002.

A. L. Baylor and J. Ryu, The API (Agent Persona Instrument) for assessing pedagogical agent persona, Proceedings of World Conference on Educational Multimedia, Hypermedia and Telecomunications, pp.448-451, 2003.

A. L. Baylor and Y. Kim, Simulating Instructional Roles through Pedagogical Agents, In International Journal of Artificial Intelligence in Education, vol.15, issue.1, 2005.

E. Shaw and W. , Lewis Johnson; Rajaram Ganeshan: Pedagogical agents on the Web, Proceedings of the third annual conference on Autonomous Agents, pp.283-290, 1999.

A. Gulz and M. Haake, Design of animated pedagogical agents???A look at their look, International Journal of Human-Computer Studies, vol.64, issue.4, pp.322-339, 2006.
DOI : 10.1016/j.ijhcs.2005.08.006

C. L. James, A. C. Sharolyn, E. K. Susan, S. T. Barlow, A. S. Brian et al., The persona effect: affective impact of animated pedagogical agents, proceedings of the SIGCHI conference on Human factors in Computing Systems, pp.359-366, 1997.

W. L. Johnson, J. W. Rickel, and J. C. Lester, Animated pedagogical agents: face-to-face interaction in interactive learning environments, International Journal of Artificial Intelligence in Education, vol.11, pp.47-78, 2000.

Y. Kim, Pedagogical Agent as Learning Companion: Its Constituents and Educational Implications, Proceedings of World Conference on E-Learning in Corporate, Government, Healthcare, and Higher Education, pp.2229-2236, 2003.
DOI : 10.1111/j.1365-2729.2006.00210.x
URL : https://works.bepress.com/yanghee_kim/6/download/

A. Kumar, Using online tutors for learning -What do students think?, In proceedings of Frontiers in Education Conference, 2004.

J. C. Lester, S. A. Converse, B. A. Stone, S. E. Kahler, and S. T. Barlow, Animated pedagogical agents and problem-solving effectiveness: A large-scale empirical evaluation, proceedings of the eight world conference on Artificial Intelligence in Education, pp.23-30, 1997.

A. Paiva, I. Machado, and C. Martinho, Enriching pedagogical agents with emotional behaviour: the case of Vincent, AIED workshop on instructional uses of synthetic characters, 1999.

A. J. Patricia, S. Pesty, and R. Vicari, An animated pedagogical agent that interacts affectively with the student, proceedings of the 11 th International Conference on Artificial Intelligence in Education (AIED), 2003.

T. Smith, G. Affleck, B. Lees, and C. Branki, implementing a generic framework for a webbased pedagogical agent, ASCILITE99 Conference Proceedings, 1999.

E. Sklar and D. Richards, The use of agents in human learning systems, Proceedings of the fifth international joint conference on Autonomous agents and multiagent systems , AAMAS '06, pp.767-774, 2006.
DOI : 10.1145/1160633.1160768