APA (7th ed.) Citation

United States. Public Health Service. (1943). What you don't know can hurt yon [concerning syphilis and gonorrhea]. [s.n.].

Chicago Style (17th ed.) Citation

United States. Public Health Service. What You Don't Know Can Hurt Yon [concerning Syphilis and Gonorrhea]. [Washington]: [s.n.], 1943.

MLA (9th ed.) Citation

United States. Public Health Service. What You Don't Know Can Hurt Yon [concerning Syphilis and Gonorrhea]. [s.n.], 1943.