APA

National Institutes of Health (U.S.), . (19). Aging and accidents. [Washington, D.C: .

Chicago

National Institutes of Health (U.S.), . 19. Aging and accidents. [Washington, D.C: .

Harvard

National Institutes of Health (U.S.), . (19). Aging and accidents. [Washington, D.C: .

MLA

National Institutes of Health (U.S.), . Aging and accidents. [Washington, D.C: . 19.