APA-viite (7. p.)

Urton, G. (2003). Signs of the Inka Khipu: Binary coding in the Andean knotted-string records. University of Texas Press.

Chicago-viite (17. p.)

Urton, Gary. Signs of the Inka Khipu: Binary Coding in the Andean Knotted-string Records. Austin: University of Texas Press, 2003.

MLA-viite (9. p.)

Urton, Gary. Signs of the Inka Khipu: Binary Coding in the Andean Knotted-string Records. University of Texas Press, 2003.