APA (7th ed.) Citation

National Institute of Allergy and Infectious Diseases (U.S.). (2007). Understanding the immune system: How it works. U.S. Dept. of Health and Human Services, National Institutes of Health, National Institute of Allergy and Infectious Diseases.

Chicago Style (17th ed.) Citation

National Institute of Allergy and Infectious Diseases (U.S.). Understanding the Immune System: How It Works. [Bethesda, Md.]: U.S. Dept. of Health and Human Services, National Institutes of Health, National Institute of Allergy and Infectious Diseases, 2007.

MLA (9th ed.) Citation

National Institute of Allergy and Infectious Diseases (U.S.). Understanding the Immune System: How It Works. U.S. Dept. of Health and Human Services, National Institutes of Health, National Institute of Allergy and Infectious Diseases, 2007.