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P. Nordmann, Bidrag till Helsingfors stads historia [Contributions to Helsinki History], Skrifter utgifna af Svenska litteratursällskapet i Finland ;69, 72, 76, 82, 86 (in Swedish) – via HathiTrust 1905–1908, 5 vols.
William Henry Overall, ed. (1870). "Helsingfors". Dictionary of Chronology. London: William Tegg. hdl:2027/uc2.ark:/13960/t9m32q949.
I. Uschakoff, ed. (1898). "Helsinki". Suomi: hakemisto sisältävä maantieteellistilastollisia ja teollisuutta koskevia tietoja [Finland: Directory] (in Finnish). Helsinki: Weilin & Göös [fi].
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External linksedit
Wikimedia Commons has media related to History of Helsinki.
Europeana. Items related to Helsinki, various dates.
Digital Public Library of America. Items related to Helsinki, various dates