4/21/78
MLA
United States. Office of the White House Staff Secretary. "4/21/78." Jimmy Carter Library. 1978-04-21, https://www.jimmycarterlibrary.gov/digital_library/sso/148878/72/SSO_148878_072_07.pdf.
APA
United States. Office of the White House Staff Secretary (1978-04-21). 4/21/78. Retrieved from https://www.jimmycarterlibrary.gov/digital_library/sso/148878/72/SSO_148878_072_07.pdf
Chicago
United States. Office of the White House Staff Secretary. "4/21/78." 1978-04-21. July 17, 2025. https://www.jimmycarterlibrary.gov/digital_library/sso/148878/72/SSO_148878_072_07.pdf.
