Presidential Document
Chicago Manual 14.289
See examples below:
Notes-Bibliography Style
1st Footnote or Endnote
15. Exec. Order No. 11,609, 3 C.F.R. 586 (1971-75).
Bibliography
Usually not cited in bibliography.
Author-Date Style
1st Parenthetical Note
(US President 2010, 82215)
Reference List
US President. 2010. Proclamation 8621. "National Slavery and Human Trafficking
Prevention Month, 2011." Federal Register 75, no. 250 (December 30):
82215-16.