John Playfair (1788):Account of Matthew Stewart, D.D. In: Transactions of the Royal Society of Edinburgh; vol. 1, pp. 57-76. Via: HathiTrust (in: Google Books), PDF-bestand. Gearchiveerd op 13 december 2021.
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John Playfair (1788):Account of Matthew Stewart, D.D. In: Transactions of the Royal Society of Edinburgh; vol. 1, pp. 57-76. Via: HathiTrust (in: Google Books), PDF-bestand. Gearchiveerd op 13 december 2021.