“W.L. Korthals Altes, Changing economy in Indonesia. A selection of statistical source material from the early 19th century up to 1940, XV, Prices (non-rice) 1814-1940”, BMGN-LCHR, vol. 111, no. 3, pp. 406–407, Jan. 1996, doi: 10.18352/bmgn-lchr.4311.