＜図書＞
Medical care, health status, and family income, United States : statistics on personal health expenditures, health insurance converage, the use of medical and dental services, chronic illness and disability, acute illness, and disability days, by family income, size of family, age, and sex : based on data collected in household interviews
(Public Health Service publication ; no. 1000 . Vital and health statistics ; ser. 10 . data from the National Health Survey ; no. 9)