Longitudinal Studies
Ruchlin, H. S., Morris, J. N., Gutkin, C. E., Sherwood, S. 1989. Expenditures for long-term care services by community elders. Health Care Financing Review. 10 (3) 55-65.
Hirdes, J. P., Brown, K. S., Vigoda, D. S., Forbes, W. F., Crawford, L. 1987. Health effects of cigarette smoking: data from the Ontario Longitudinal Study on Aging. Canadian Journal of Public Health Revue Canadienne de Sante Publique. 78 (1) 13-7.