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2. Bergsøe, P. (1937) The Metallurgy and Technology of Gold and Platinum among the Pre-Columbian Indians. Ingeniørvidenskabelige Skrifter, A44, Copenhagen
3. Bergsøe, P. (1938) The gilding process and the metallurgy of copper and lead among the Pre-Columbian Indians. Ingeniørvidenskabelige Skrifter, A46, Copenhagen
4. Bonhams (1992) Tribal Art (Sale catalogue), London, 23 June 1992
5. The Gold of El Dorado;Bray,1978