Cobean, Robert H.; García, Elizabeth Jiménez; Mastache, Alba Guadalupe (28 July 2016). Tula (in Spanish). Fondo de Cultura Economica. ISBN9786071640475.
Cobean, Robert H.; García, Elizabeth Jiménez; Mastache, Alba Guadalupe (28 July 2016). Tula (in Spanish). Fondo de Cultura Economica. ISBN9786071640475.