*[https://bioguide.congress.gov/search/bio/F000369 Profile] at the ''Biographical Directory of the United States Congress
*[https://bioguide.congress.gov/search/bio/F000369 Profile] at the ''Biographical Directory of the United States Congress
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*[https://www.nytimes.com/1862/07/19/archives/newark-union-mass-meeting-newjersey-in-for-the-war-newark-will.html NEWARK UNION MASS MEETING.; New-Jersey in for the War Newark Will Supply Her Quota. Speeches of Frederick T. Frelinghuysen, Rev. Mr. Poor, Cortlandt Parker and Others. SUBSCRIPTIONS TO AID RECRUITING, &C. SPEECH OF FREDERICK T. FRELINGBOGSEN. SPEECH OF REV. D.W. POOR. CONTRIBUTIONS TO THE CAUSE SPEECH OF CORTLANDT PARKER, ESQ. WOUNDED SOLDIERS. THE FINALE.] – ''The New York Times'', published July 19, 1862 (article behind paywall, archived version available [https://archive.md/ON8IA here])
*[https://www.findagrave.com/memorial/4835/frederick-theodore-frelinghuysen Profile] at ''Find a Grave
*[https://www.findagrave.com/memorial/4835/frederick-theodore-frelinghuysen Profile] at ''Find a Grave