Dongwi, Beata Lididimikeni. “Using the Van Hiele Phases of Instruction to Design and Implement a Circle Geometry Teaching Programme in a Secondary School in Oshikoto Region: A Namibian Case Study”. The Namibia CPD Journal for Educators (February 23, 2018): 4–62. Accessed December 22, 2024. https://journals.unam.edu.na/index.php/NCPDJE/article/view/1270.