1. BBC News: Học online vì Covid-19: ‘Thách thức thực sự’ cho giáo dục Viet Nam (2021). https://www.bbc.com/vietnamese/vietnam-58441010
2. Bozkurt, A., Jung, I., Xiao, J., et al.: A global outlook to the interruption of education due to COVID-19 Pandemic: Navigating in a time of uncertainty and crisis. Asian J. Dist. Educ. 15(1), 1–126 (2020). https://www.aacademica.org/ignacio.aranciaga/87.pdf
3. Butterfield, L.D., Borgen, W.A., Amundson, N.E., Maglio, A.T.: Fifty years of Critical Incident Technique: 1954–2004 and beyond. Qual. Res. 5, 457–497 (2005). https://psycnet.apa.org/doi/10.1177/1468794105056924
4. Chen, S., Le, T.T.: Teaching of Culture in English as an International Language: An Integrated Model. Routledge, London (2019)
5. Chen, S., Le, T.T.: The TESOL Research Training Journey: Voices from International PhD Students. Routledge, London (2021)