↑ Frank Huisman (1992). Stadsbelang en standsbesef: gezondheidszorg en medisch beroep in Groningen 1500-1730 (in Dutch). Erasmus Publishing. ISBN978-90-5235-037-0.
↑ Sandi E. Cooper (1991). "Peace Societies". Patriotic Pacifism: Waging War on War in Europe, 1815–1914. Oxford University Press. ISBN978-0-19-536343-2.
G. van Herwijnen, ed. (1978). "Groningen". Bibliografie van de stedengeschiedenis van Nederland[Bibliography of Urban History in the Netherlands] (in Dutch). Brill. pp.26+. ISBN90-04-05700-5.
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