Amina Abubakar,  A Linguistic Analysis of the Inconsistencies in the Meaning of Some -er Suffix Morphemes.   journal   = {International Journal of Educational and Pedagogical Sciences}, [online]. World Academy of Science, Engineering and Technology.
    November 2015, vol. 107(11). 4015 - 4018
    [viewed 24 April 2024]. Available from: https://publications.waset.org/pdf/10003204.