G. G. Bitter and D. R. Meylani, “The Effect of an m-Learning English Speaking Software App on Students in the Chiang Rai Municipality Schools 6 and 7 in Thailand”, Int J Innov Educ Res, vol. 4, no. 11, pp. 82–100, Nov. 2016, doi: 10.31686/ijier.vol4.iss11.9.