＜図書＞
Disability days, United States, July 1961-June 1962 : statistics on volume of restricted-activitiy days, bed-disability days, work-loss days, and school-loss days, by age, sex, family income, residence, usual activity status, occupation, and industry : based on data collected in household interviews during the period July 1961-June 1962
(Public Health Service publication ; no. 1000 . Vital and health statistics ; ser. 10 . data from the National Health Survey ; no. 4)