“Thomas Ignatius Ferreira (c. 1743-1814), Oosgrenspionier en Britse bevelvoerder van Fort Frederick”, HASA, vol. 35, no. 2, Jun. 2021, Accessed: Nov. 07, 2025. [Online]. Available: http://www.jsaa.ac.za/index.php/historia/article/view/1782