Evans, R.H. A catalogue of the library of the late John, Duke of Roxburghe, 1812: t.p. (G. Nicol)
LC data base, 1-29-85 (hdg.: Nicol, George, bookseller; usage: G. Nicol) LC manual auth. cat. (hdg.: Nicol, George, bookseller; usage: G. Nicol)
Plomer, H. Dict. of printers and booksellers, 1726-1775, 1932 (Nicol or Nichol, George, bookseller in London (1) opposite York Buildings, Strand (2) Pall Mall; active 1769-1829, d. 25 June 1829, aged 88)