Clark, D. W., & Williams, T. F. (1976). Teaching of chronic illness and aging: A conference sponsored by the John E. Fogarty International Center for Advanced Study in the Health Sciences, and the Association of Teachers of Preventive Medicine, National Institutes of Health, Bethesda, M. Dept. of Health, Education, and Welfare, Public Health Service, National Institutes of Health.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Clark, Duncan W., و Thomas Franklin Williams. Teaching of Chronic Illness and Aging: A Conference Sponsored by the John E. Fogarty International Center for Advanced Study in the Health Sciences, and the Association of Teachers of Preventive Medicine, National Institutes of Health, Bethesda, M. Bethesda, MD: Dept. of Health, Education, and Welfare, Public Health Service, National Institutes of Health, 1976.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Clark, Duncan W., و Thomas Franklin Williams. Teaching of Chronic Illness and Aging: A Conference Sponsored by the John E. Fogarty International Center for Advanced Study in the Health Sciences, and the Association of Teachers of Preventive Medicine, National Institutes of Health, Bethesda, M. Dept. of Health, Education, and Welfare, Public Health Service, National Institutes of Health, 1976.