APA

National Institutes of Health (U.S.), . (1972). Keep your teeth for life, pull strings: we call it flossing, ask your dentist he'll tell you how. [Washington, D.C: .

Chicago

National Institutes of Health (U.S.), . 1972. Keep your teeth for life, pull strings: we call it flossing, ask your dentist he'll tell you how. [Washington, D.C: .

Harvard

National Institutes of Health (U.S.), . (1972). Keep your teeth for life, pull strings: we call it flossing, ask your dentist he'll tell you how. [Washington, D.C: .

MLA

National Institutes of Health (U.S.), . Keep your teeth for life, pull strings: we call it flossing, ask your dentist he'll tell you how. [Washington, D.C: . 1972.