United States

Mor, V., Branco, K., Fleishman, J., Hawes, C., Phillips, C., Morris, J., Fries, B. 1995. The structure of social engagement among nursing home residents. Journals of Gerontology Series B-Psychological Sciences & Social Sciences. 50 (1) P1-P8.
Fries, B. E., Ikegami, N. 1994. Heading in the right direction. Gerontologist. 34 (5) 582-3.

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