https://insightcrime.org/wp-content/uploads/2023/05/El-flujo-de-precursores-quimicos-para-la-produccion-de-drogas-sinteticas-en-Mexico-InSight-Crime-May-2023.pdf
http://library.fes.de/pdf-files/dialog/13464.pdf
https://theconversation.com/por-que-escribimos-mexico-pero-decimos-mejico-la-relacion-de-la-grafia-x-con-la-pronunciacion-de-la-jota-217617