1. Ahmadpour, A. & Mirdamadi, M. (2010). Determining challenges in the application of e-learning in agricultural extension services in Iran. American-Euroasian Journal of Agriculture and Environmental Science, 9(3), 292-296. http://www.idosi.org/aejaes/jaes9(3)/11.pdf
2. Almerich, G., Suárez, J.M., Jornet, J.M. & Orellana, M.N. (2011). Las competencias y el uso de las Tecnologías de Información y Comunicación (TIC) por el profesorado: estructura dimensional. Revista Electrónica de Investigación Educativa, 13(1), 28-42. http://redie.uabc.mx/vol13no1/contenido-almerichsuarez.html
3. Antonijevic, R. (2007). Usage of computers and calculators and students’ achievement: Results from TIMSS 2003. International Conference on Informatics, Educational Technology and New Media in Education. Sombor. https://bit.ly/2A4HiQT
4. Carpenter, J.P. & Green, T.D. (2017). Mobile instant messaging for professional learning: Educators’ perspectives on and uses of Voxer. Teaching & Teacher Education, 68, 53-97. http://dx.doi.org/10.1016/j.tate.2017.08.008
5. Christ, T., Arya, P. & Chiu, M.M. (2017). Video use in teacher education: An international survey of practices. Teaching & Teacher Education, 63, 22-35. http://dx.doi.org/10.1016/j.tate.2016.12.005