Emmerich, A.: Sweat of the Sun and Tears of the Moon, Gold and Silver in Pre-Columbian Art, Seattle, 1965; Gallo, M.M.: The Gold of Peru, Masterpieces of Goldsmith's work of Pre-Incan and Incan time and the colonial Period, Recklinghausen, 1959; Disselhoff, H.D.: Daily Life in Ancient Peru, Munich, 1967; Breck, J. et al.: Peruvian Textiles, Examples of the Pre-Incaic period, New York, 1930; De Alba, G.H. et al.: El museo del oro, Bogota, 1948; Hoyle, R.L.: Pérou, Geneva, 1968; Kennedy Easby, E.: Ancient Art of Latin America, From the Collection of Jay C. Leff, New York, 1966; Del Pomar, F.C.: The art of Ancient Perù, New York, 1971; and five other books and publications of related interest (13)