von Buchenroder, W. L. 1830. “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”. South African Quarterly Journal 1 (1): 18-25. https://doi.org/10.21504/saqj.11.2613.