APA

National Institutes of Health (U.S.), . (19). Computed tomographic scanning of the brain. [Washington, D.C: .

Chicago

National Institutes of Health (U.S.), . 19. Computed tomographic scanning of the brain. [Washington, D.C: .

Harvard

National Institutes of Health (U.S.), . (19). Computed tomographic scanning of the brain. [Washington, D.C: .

MLA

National Institutes of Health (U.S.), . Computed tomographic scanning of the brain. [Washington, D.C: . 19.