The history of the area (archaeological research)

Shpilevsky, Sergei Mikhailovich (1833-1907). Ancient cities and other Bulgar-Tatar monuments in the Kazan province. Kazan: Univ. type., 1877.

ГПИБ

Saveliev, Vikt.Russkie coins, found in 1854, near Kazan. [St. Petersburg]: B. and., [1857].

НБ РАХ