MacColl, E. Kimbark (November 1976). The Shaping of a City: Business and politics in Portland, Oregon 1885 to 1915. Portland, Oregon: The Georgian Press Company. OCLC2645815.
Pontus, Rudberg (2017). The Swedish Jews and the Holocaust. Milton Park, Abingdon, Oxon. ISBN9781138045880. OCLC972901368.{{cite book}}: CS1 maint: location missing publisher (link)