Xunan Huang and  Caicai Zhang,  A Corpus-Based Analysis on Code-Mixing Features in Mandarin-English Bilingual Children in Singapore.   journal   = {International Journal of Cognitive and Language Sciences}, [online]. World Academy of Science, Engineering and Technology.
    March 2018, vol. 136(4). 541 - 545
    [viewed 19 September 2020]. Available from: https://publications.waset.org/pdf/10008904.