Manzi, W. I., M. Mosia, B. Moreeng, and T. Masvosve. “Grade 12 Learners’ Perceptions of Opportunities to Learn Imperfect Market Structures: Frances Baard District”. International Journal of Learning, Teaching and Educational Research, vol. 20, no. 9, Sept. 2021, pp. 255-71, http://www.ijlter.net/index.php/ijlter/article/view/34.