K.P. Companje, Convergerende belangen. Belangenbehartiging van de zorgverzekeraars in historisch perspectief 1900-2001; K. Horstman, Public bodies, private lives. The historical construction of life insurance, health risks, and citizenship in the Netherlands 1880-1920 - Kerkhoff, A.H.M. (BMGN - Low Countries Historical Review, 2003)