Key, Wilhelmine E. (1915). FEEBLE-MINDED CITIZENS IN PENNSYLVANIA. Public charities association of Pennsylvania. Publication No. 16. Empire Building, Philadelphia: The Public Charities Association of Pennsylvania. ASINB008FUCFUK.
"Wilhelmine Enteman", United States census, 1880; Hartland, Waukesha, Wisconsin; page 25, line 6, enumeration district 260, National Archives film number T9-1451. Retrieved on September 18, 2022.
Key, Wilhelmine E. (1915). FEEBLE-MINDED CITIZENS IN PENNSYLVANIA. Public charities association of Pennsylvania. Publication No. 16. Empire Building, Philadelphia: The Public Charities Association of Pennsylvania. ASINB008FUCFUK.