Schipper, Douwe. “Challenging ’Derivative’ Explanations of Scientific Racism: The Case of Dr. J.C. De Man (1818-1909)”. Studium 10, no. 1 (June 30, 2017): 1–17. Accessed December 22, 2024. https://platform.openjournals.nl/studium/article/view/20401.