Joint Resolution Proposing the <a href="https://en.wikipedia.org/wiki/Twenty-sixth_Amendment_to_the_United_States_Constitution" class="extiw" title="w:Twenty-sixth Amendment to the United States Constitution">Twenty-sixth Amendment to the United States Constitution</a>.
U.S. Government
NARA <a rel="nofollow" class="external autonumber" href="https://www.archives.gov/national-archives-experience/charters/charters_downloads.html">[1]</a>