Essen, G. van. “A.H. Huussen jr., J.F.A. Paaschen-Louwerse, Jacoba Van Heemskerck Van Beest 1876-1923”. BMGN - Low Countries Historical Review, vol. 122, no. 3, Jan. 2007, https://doi.org/10.18352/bmgn-lchr.6662.