Andrews, J. Richard (2003), Workbook for Introduction to Classical Nahuatl, Norman: University of Oklahoma Press, page 265
    Carochi, Horacio (2001), James Lockhart, transl., Grammar of the Mexican Language, with an Explanation of its Adverbs (1645), Stanford, California: Stanford University Press, pages 326–327
    Karttunen, Frances (1983), An Analytical Dictionary of Nahuatl, Austin: University of Texas Press, page 331