“J.R.G. Schuur, Appelscha. Bolwerk Van Anarchisme En Radicaal Socialisme”. BMGN - Low Countries Historical Review 114, no. 3 (January 1, 1999): 445–446. Accessed October 11, 2024. https://ojstest.minions.amsterdam/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-105795.