Jansen, P. C. M. (2005). Jansen, P. C. M.; Cardon, D. (eds.). "Bixa orellana L."PROTA 3: Dyes and tannins/Colorants et tanins. PROTA. Archived from the original on 20 November 2008. Retrieved 5 Oct 2014.
Jansen, P. C. M. (2005). Jansen, P. C. M.; Cardon, D. (eds.). "Bixa orellana L."PROTA 3: Dyes and tannins/Colorants et tanins. PROTA. Archived from the original on 20 November 2008. Retrieved 5 Oct 2014.