1. Ministry of Health, Labour and Welfare (Ed.), “White Papers & Reports – Annual Health, Labour and Welfare Report 2007-2008 –,” GYOSEI, 2009. (in Japanese)
2. Statistics and Information Department, Minister’s Secretariat, Ministry of Health, Labour and Welfare (Ed.), “Survey of Institutions and Establishments for Long-term Care 2007,” 2009. (in Japanese)
3. A. H. Fine (Ed.), “Handbook on Animal-Assisted Therapy,” 2nd Edition, Theoretical Foundations and Guidelines for Practice, Academic Press, 2006.
4. J. Gammonley and J. Yates, “Pet Projects: Animal Assisted Therapy in Nursing Homes,” J. of Gerontological Nursing, Vol.17, No.1, pp. 12-15, 1991.
5. T. Shibata, K.Wada, T. Saito, and K. Tanie, “Robot Assisted Activity for Senior People at Day Service Center,” Proc. of Int. Conf. on Information Technology in Mechatronics, pp. 71-76, 2001.