Aandenken geschrift deur Johannes Diederik van der Merwe (20.2.1885-20.12.1931). Historia, [S. l.], v. 11, n. 1, 2021. Disponível em: https://upjournals.up.ac.za/index.php/historia/article/view/3280.. Acesso em: 31 jan. 2025.