Inca (Inka) Quipu (Khipu) at the Dallas Museum of Art: The Nora and John Wise Collection
Andean cultures did not have a recognizable written script prior to the Spanish conquest in the early 1530s; however, the Inca did utilize a method of recording through knotted cords, known as quipu (khipu; “knot” in Quechua). The Nora and John Wise Collection at the Dallas Museum of Art includes nineteen quipu fragments. The quipu (khipu) have Z-spun, S-plied cords. According to Ann Rowe and Gary Urton, the Inca (Inka) generally used Z-spun and S-plied yarn in weaving textiles and within quipu., 
 Textile specialist Ann Pollard Rowe is the former Curator of Western Hemisphere Collections at The Textile Museum, Washington, DC. Gary Urton is the Dumbarton Oaks Professor of Pre-Columbian Studies at Harvard University, and a specialist in Andean archaeology, particularly the khipu.
 Gary Urton, Signs of the Inka Khipu: Binary Coding in the Andean Knotted-String Records (Austin, TX: University of Texas Press, 2003): 66.
- Kimberly L. Jones, PhD, Inca: Conquests of the Andes / Los Incas y las conquistas de los Andes, Label text [1983.W.2174], 2015.
- Kylie Quave, PhD, DMA unpublished material, 2006.
- Smithsonian National Museum of the American Indian
Watch a video about quipu and the Inca Empire.
- Harvard University
Learn more about quipu and the Khipu Database Project.
- The Metropolitan Museum of Art
Read more about Andean Textiles.
Read a 2007 article about the mystery of the Inca and quipu.
- The Harvard Gazette
Read an article about how Harvard student Manny Medrano '19, with guidance from Professor Gary Urton, decoded the meaning behind quipus.
- CBC Radio
Read more or listen to the original radio broadcast with Harvard student Manny Medrano and his recent discoveries about quipu.