This primary source comes from the Collection DDE-WHCF: White House Central Files (Eisenhower Administration).
Full Citation: Press Release, Statement by the President Supporting the Drive for Polio Vaccinations; 5/17/1958; OF 117-I-1 Salk Polio Vaccine (10); Official Files, 1953 - 1961; Collection DDE-WHCF: White House Central Files (Eisenhower Administration); Dwight D. Eisenhower Library, Abilene, KS. [Online Version, https://www.docsteach.org/documents/document/press-release-president-supporting-polio-vaccinations, May 3, 2024]