1. Dwight, D. Eisenhower Presidential Library, Abilene, Kansas. (DDEL).
2. Harry, S. Truman Presidential Library, Independence, Missouri. (HSTL).
3. National Archives and Records Administration, College Park, MA, United States. (NARA).
4. Office of the Historian US Department of State Foreign Relations of the United States 1955–1957 Eastern Europe Volume XXV: https://history.state.gov/historicaldocuments/frus1955-57v25
5. Public Law 480 ‘Agricultural Trade Development and Assistance Act of 1954 and Amendments’, U.S. House of Representatives: https://www.govinfo.gov/content/pkg/STATUTE-68/pdf/STATUTE-68-Pg454-2.pdf