D.M.W. (1910). "ALexander II (1818–1881)". The Encyclopaedia Britannica; A Dictionary of Arts, Sciences, Literature and General Information. Vol. I (A to Andro) (11th ed.). Cambridge: University Press. pp. 559–61. பார்க்கப்பட்ட நாள் 28 December 2018 – via Internet Archive.