1. https://observatory.tec.mx/edu-news/world-bank-tec21-tec-de-monterrey-educational-model https://observatory.tec.mx/edu-news/world-bank-tec21-tec-de-monterrey-educational-model
2. Rosaspage. History of the Meccano. Retrieved from: http://www.rosaspage.com/art/emeccano.html Rosaspage. History of the Meccano. Retrieved from: http://www.rosaspage.com/art/emeccano.html
3. https://innovacioneducativa.tec.mx/project/metodologias-para-la-solucion-de-problemas/ https://innovacioneducativa.tec.mx/project/metodologias-para-la-solucion-de-problemas/