WASET
    Juan Manuel Real-Espinosa,  On a Theoretical Framework for Language Learning Apps Evaluation.   journal   = {International Journal of Cognitive and Language Sciences}, [online]. World Academy of Science, Engineering and Technology.
    December 2022, vol. 192(12). 579 - 586
    [viewed 11 May 2024]. Available from: https://publications.waset.org/pdf/10012837.