4/21/77 [2]
MLA
United States. Office of the White House Staff Secretary. "4/21/77 [2]." Jimmy Carter Library. 1977-04-21, https://www.jimmycarterlibrary.gov/digital_library/sso/148878/17/SSO_148878_017_02.pdf.
APA
United States. Office of the White House Staff Secretary (1977-04-21). 4/21/77 [2]. Retrieved from https://www.jimmycarterlibrary.gov/digital_library/sso/148878/17/SSO_148878_017_02.pdf
Chicago
United States. Office of the White House Staff Secretary. "4/21/77 [2]." 1977-04-21. July 4, 2025. https://www.jimmycarterlibrary.gov/digital_library/sso/148878/17/SSO_148878_017_02.pdf.
