State (U.S.), National Association of Secretaries of; State (U.S.), National Association of Secretaries of. National Association of Secretaries of State Handbook. National Association of Secretaries of State. [2023-05-03]. (原始内容存档于2023-05-03) (英语).
State (U.S.), National Association of Secretaries of; State (U.S.), National Association of Secretaries of. National Association of Secretaries of State Handbook. National Association of Secretaries of State. [2023-05-03]. (原始内容存档于2023-05-03) (英语).