W. L. von Buchenroder, “An account of the earthquakes which occurred at the Cape of Good Hope, during the month of December, 1809: with a meteorological table, from the 4th to the 27th: and an appendix containing Notices of Shocks which have occurred at various other periods”, S. Afr. Q. J., vol. 1, no. 1, pp. 18–25, Oct. 1830, doi: 10.21504/saqj.11.2613.