Personal Communication
Chicago Manual 14.214; 15.53
See examples below:
Notes-Bibliography Style
1st Footnote or Endnote
2. Maxine Greene, conversation with author, April 23, 2012.
Bibliography
Usually not cited in bibliography.
Author-Date Style
1st Parenthetical Note
(Maxine Greene, conversation with author, April 23, 2012)
Reference List
Usually not cited in Reference List