Παραπομπή σε μορφή APA (7η εκδ.)

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

Παραπομπή σε μορφή Chicago (17η εκδ.)

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

Παραπομπή σε μορφή MLA (9th εκδ.)

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