Fatima Muhammad Shitu,  Collocation Errors in English as Second Language (ESL) Essay Writing.   journal   = {International Journal of Cognitive and Language Sciences}, [online]. World Academy of Science, Engineering and Technology.
    November 2015, vol. 105(9). 3270 - 3277
    [viewed 11 April 2021]. Available from: https://publications.waset.org/pdf/10003328.