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Iverson, Shannon Dugan. "The Enduring Toltecs: History and Truth During the Aztec-to-Colonial Transition at Tula, Hidalgo". Journal of Archaeological Method and Theory. 24 (1):. 1 March 2017. 90–116. doi:10.1007 (#bad_doi). ISSN1573-7764.
Smith, Michael E.; Diehl, Richard A.; Berlo, Janet Catherine. "Mesoamerica after the Decline of Teotihuacan A. D. 700-900 ". Ethnohistory. 40 (1): 143. 1993. doi:10.2307/482182. (#bad_doi). ISSN0014-1801. (#bad_issn).
Kowalski, Jeff Karl; Kristin-Graham, Cynthia, redaktorlar Twin Tollans: Chichén Itzá, Tula, and the epiclassic to early postclassic Mesoamerican world. Dumbarton Oaks Research Library and Collection. 2011. ISBN978-0-88402-372-2. OCLC916484803.