1. A historical note on method of least-squares
2. G. Bowditch Adrain, Robert Adrain, L.L.D. The United States Magazine and Democratic Review (June, 1844) 646–656.
3. Analyst, The; or Mathematical Museum, Robert Adrain (ed). Philadelphia: William P. Farrand and Co. (1808–09) 813–814. See Karpenski pp. 581–583.