Moura, Rui. Thomas Staunton St. Clair: the Sword, the Pen and the Paintbrush. Revista De Estudos Anglo-Portugueses / Journal of Anglo-Portuguese Studies. no. 30, 2021, pp. 41-92. https://www.academia.edu/64087129/Thomas_Staunton_St_Clair_the_Sword_the_Pen_and_the_Paintbrush
Feibel, Robert. Journal of the Society for Army Historical Research, Vol. 48, No. 193 (SPRING 1970), pp. 29-34 https://www.jstor.org/stable/44229227
Thomas St. Clair. A Soldier’s Recollections of the West Indies and America: With a Narrative of the Expedition to the Island of Walcheren. London: R. Bentley, 2 vols., 1834
Vol 1 - https://books.google.pt/books?id=4CQCAAAAYAAJ
Vol 2 - https://books.google.pt/books?id=xSQCAAAAYAAJ
Thomas St. Clair. Sketches in Spain, Portugal and France, During the War Taken by Lieut. Col. Thos. Staunton St. Clair, From 1810 to 1813. [1810-1813]. [Watercolour Album, 9 plates]. Yale University, New Haven, Connecticut. Beinecke Rare Book and Manuscript Library. https://collections.library.yale.edu/catalog/15234653
Thomas St. Clair. Twelve Views of the Principal Occurrences of the Campaigns of 1810 and 1811 in Spain and Portugal. Engraved by Charles Turner. London, 1812-1815. [Aquatint with etching and engraving; printed on paper; hand coloured; edged with paper, 12 plates]. London, Royal Collection, Collection of Military and Naval Maps and Prints formed by George III (1738-1820) https://militarymaps.rct.uk/napoleonic-wars-1803-15/spain-twelve-views-of-the-principal-occurences-of-the
Gibraltar paintings (Thomas Staunton St. Clair)
https://gibraltar-intro.blogspot.com/2012/07/chapter-1826-thomas-staunton-st.html?m=1