Citazione Stile APA (7a Edizione)
(1978). <The> Elderly population: 1976 : estimates by county. U. S. Department of health, educationaad welfare.
Citazione stile Chigago Style (17a edizione)
<The> Elderly Population: 1976 : Estimates by County. Washington: U. S. Department of health, educationaad welfare, 1978.
Citatione MLA (9a ed.)
<The> Elderly Population: 1976 : Estimates by County. U. S. Department of health, educationaad welfare, 1978.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.