APA

National Institutes of Health (U.S.), . (198). Aging and foot problems. [Washington, D.C: .

Chicago

National Institutes of Health (U.S.), . 198. Aging and foot problems. [Washington, D.C: .

Harvard

National Institutes of Health (U.S.), . (198). Aging and foot problems. [Washington, D.C: .

MLA

National Institutes of Health (U.S.), . Aging and foot problems. [Washington, D.C: . 198.