Digital

• The Open Khipu Repository (OKR)
  • Formerly known as the Harvard Khipu Database Project.
• The Khipu Field Guide (KFG)

In print

• Numbers and Relations from Ancient Andean Quipus
  • An article published by Marcia Ascher and Robert Ascher in 1972 which contains the descriptions and data for 9 khipus (AS1–AS9).
• Code of the Quipu: Databooks I and II
  • Originally published in 1978 (book I) and 1988 (book II), these volumes contain the descriptions and data for the more than 200 khipus (AS10–AS215) studied Marcia Ascher and Robert Ascher.
• Descripción de los quipus del Museo de Sitio de Pachacamac
  • A 2006 book by Hugo Pereyra Sánchez.
• Descripción de Una Muestra de Quipus Del Museo Nacional de Arqueología, Antropología e Historia Del Perú.
  • A 2011 book by Hugo Pereyra Sánchez.