1. Baraka, K., Alves-Oliveira, P., Ribeiro, T.: An extended framework for characterizing social robots. In Human-Robot Interaction, pp. 21–64. Springer, Cham (2020)
2. Chuan Lin, M., Chang, D.: Enhancing post-secondary writers' writing skills with a Chatbot: a mixed-method classroom study. J. Educ. Technol. Soc. 23(1), 78–92 (2020)
3. Clarizia, F., Colace, F., Lombardi, M., Pascale, F., Santaniello, D.: Chatbot: An education support system for student. In: International Symposium on Cyberspace Safety and Security, pp. 291–302. Springer, Cham (2018)
4. Creswell, J.W.: A concise introduction to mixed methods research. SAGE publications (2014)
5. Creswell, J.W., Clark, V.L.P.: Designing and conducting mixed methods research. Sage publications (2017)