Macdonald, John. Interview with Post, Frederick, 1762-1850; (1847-10-01). Experiencing the Neutral Ground of the American Revolution: The McDonald Interviews, WCHS item 1338. Transcription courtesy of the Westchester County Historical Society (No copyright - United States).

- Hufeland Index Page 533 - October 1st Frederick Post of Yonkers: "Jacob Van Courtland who took the large house and farm under the family entailment was a very good benevolent man, universally loved. - During the war, and while residing in Courtland house he became out of health and went to New York for change of air and medical treatment where he soon after died. The estate …