REFERENCE
- Collins, S. D.: Long-Time Trends in Illness and Medical Care. Public Health Monograph No. 48, U. S. Department of Health, Education and Welfare, Public Health Service. Washington, D.C., Government Printing Office, 1957.
REFERENCE
- Brown, R. G., McKeown, T. and Whitfield, A. G. W.: Observations on the medical condition of men in the seventh decade. Brit. M. J. 1: 555–562 (March 8) 1958.