POWSTANIE STYCZNIOWE, Encyklopedia Interia: "after the fall of the uprising last elements of autonomy of the Kingdom of Poland (including the name) were abolished, transforming it into the 'Vistula land'."
Królestwo Polskie, WIEM Encyklopedia: "Kingdom of Poland after the January Uprising: the name Kingdom of Poland was replaced, in official documents, by the name of Vistula land."
Królestwo Polskie, Królestwo Kongresowe, Encyklopedia PWN: "[Congress Poland was] under German and Austro-Hungarian occupation from 1915 to 1918; it was finally abolished after the creation of the Second Polish Republic in November 1918"