The National Institute of Indigenous Peoples (INPI) and the Unesco Office in Mexico promote the dissemination of indigenous languages ​​through the use of new information and communication technologies. The XHTUMI radio station "LA Voz de la Sierra Oriente" recorded the voices of Crescenciana Chimal de Jesús and Delfina Morales Rivera, which are included in the application. All illustrations are originals made by Jorge Agustín Romero Guzmán. Programming by Francisco Javier Erazo Palacios. Texts in Otomí: Álvaro Esteban Valencia and Gerardo Sánchez Cayetano. Project coordination: Norberto Zamora Pérez. Mexico, 2021. International Decade of Indigenous Languages.