Commencement of the Terms of Office: Twentieth Amendment(PDF). Constitution of the United States of America: Analysis and Interpretation. Washington, D.C.: United States Government Printing Office, Library of Congress: 2297–98. [July 24, 2018]. (原始内容存档(PDF)于2018-07-25).
constitutioncenter.org
Larson, Edward J.; Shesol, Jeff. The Twentieth Amendment. The Interactive Constitution. Philadelphia, Pennsylvania: The National Constitution Center. [June 15, 2018]. (原始内容存档于2019-08-28).
Larson, Edward J.; Shesol, Jeff. The Twentieth Amendment. The Interactive Constitution. Philadelphia, Pennsylvania: The National Constitution Center. [June 15, 2018]. (原始内容存档于2019-08-28).
Commencement of the Terms of Office: Twentieth Amendment(PDF). Constitution of the United States of America: Analysis and Interpretation. Washington, D.C.: United States Government Printing Office, Library of Congress: 2297–98. [July 24, 2018]. (原始内容存档(PDF)于2018-07-25).