Rujukan Quipu

  1. http://www.nytimes.com/2016/01/03/world/americas/untangling-an-accounting-tool-and-an-ancient-incan-mystery.html Quipu New York Times
  2. Ordish, George; Hyams, Edward (1996). The last of the Incas: the rise and fall of an American empire. New York: Barnes & Noble. m/s. 80. ISBN 0-88029-595-3. Selenggaraan CS1: Pelbagai nama: senarai pengarang (link)
  3. Ordish, George; Hyams, Edward (1996). The last of the Incas: the rise and fall of an American empire. New York: Barnes & Noble. m/s. 69. ISBN 0-88029-595-3. Selenggaraan CS1: Pelbagai nama: senarai pengarang (link)
  4. Ordish, George; Hyams, Edward (1996). The last of the Incas: the rise and fall of an American empire. New York: Barnes & Noble. m/s. 113. ISBN 0-88029-595-3. Selenggaraan CS1: Pelbagai nama: senarai pengarang (link)