Monteiro, Ana, et al. “Challenges of Mobile Learning – a Comparative Study on Use of Mobile Devices in Six European Schools: Italy, Greece, Poland, Portugal, Romania and Turkey”. Revista De Estudios E Investigación En Psicología Y Educación, no. 13, Dec. 2017, pp. 352-7, doi:10.17979/reipe.2017.0.13.3229.