Gidding, Heather F, Margaret A Burgess, and Gwendolyn L Gilbert. “Current Issues in Immunisation: Diphtheria in Australia, Recent Trends and Future Prevention Strategies”. Communicable Diseases Intelligence 24 (June 30, 2000): 165–167. Accessed April 12, 2026. https://ojs.cdi.cdc.gov.au/index.php/cdi/article/view/2504.