@book{Röling1987,
author = {Röling, H.Q.},
title= {De tragedie van het geslachtsleven. Johannes Rutgers (1850-1924) en de Nieuw-Malthusiaane Bond. (The tragedy of sex life. Johannes Rutgers (1850-1924) and the New Malthusian Foundation)},
year = {1987},
address = {Amsterdam},
publisher = {Van Gennep},
}