A. Holtrop, Nynke van Hichtum. Leven en wereld van Sjoukje Troelstra-Bokma de Boer 1860-1939. BMGN - Low Countries Historical Review, [S. l.], v. 122, n. 2, p. 296–299, 2007. DOI: 10.18352/bmgn-lchr.6581. Disponível em: https://ojstest.minions.amsterdam/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-107530.. Acesso em: 24 nov. 2024.