Zannier, Aurelie, and Simon D. Lumbu. “The Namibian Portfolio for Languages: A Tool for Formative Assessment in Namibian Secondary Schools”. Journal for Studies in Humanities and Social Sciences (September 1, 2016): 156–162. Accessed May 1, 2024. https://journals.unam.edu.na/index.php/JSHSS/article/view/1032.