HEERING, A. J. Frieswijk, Ferdinand Domela Nieuwenhuis. De apostel van de Friese arbeiders. BMGN - Low Countries Historical Review, [S. l.], v. 105, n. 3, p. 466–467, 1990. DOI: 10.18352/bmgn-lchr.3280. Disponível em: https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-103736. Acesso em: 7 may. 2024.