- Diphtheria: MedlinePlus
- Chapter 2 – Diphtheria – 2010 Yellow Book | CDC Travelers’ Health - Centers for Disease Control and Prevention
- Disease Listing, Diphtheria, Technical Information | CDC Bacterial, Mycotic Diseases - Centers for Disease Control and Prevention
- Diphtheria - California Department of Public Health
- Diphtheria: eMedicine Emergency Medicine - Comprehensive academic article review on diphtheria.
Registration required. - Diphtheria - American Academy of Pediatrics. Comprehensive academic resource.
- Diphtheria: Bacterial Infections: Merck Manual Home Edition
