Petrushevich, Antony Stefanovich (1821-1913). Monuments of the diplomatic and judicial-business language in the ancient Galicia-Volodymyr principality and in adjacent Russian regions in the 14th and 15th centuries. Lviv: Ya.F. Golovatsky, 1867.
Archangel, Alexander Semenovich (1854-1926). Essays on the history of Russian literature and language. Kazan: lithograph of the Imperial University, 1887. 1: The oldest times of Slavic history and literature. 1887.