In-text:  Oosthuizen and McDonald (2009) provided evidence on the growth of online marking…. or at the end of the sentence, for example... Online marking is the way of the future (Oosthuizen and McDonald, 2009).

Reference list: Oosthuizen, D. and McDonald, G. (2009) “The online marking process: an overview”, The African Journal of Academics, vol. 10, no. 2, pp. 97-99.