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Origines et histoire de la Lettonie
Chambon, Henry de, (1933)
Baltische Bibliographie : Schrifttum über Estland, Lettland, Litauen ; ... mit Nachträgen
Kaegbein, Paul, (2005)
The Baltic revolution : Estonia, Latvia, Lithuania and the path to independence
Lieven, Anatol, (1993)
Latvijas vēsture : 1500 - 1600
Dunsdorfs, Edgars, (1964)
Latvia and the Baltic problem : Sketch of recent history ; english translation
Spekke, Arnolds, (1952)