A.M. Gubaidullin Fortification of Volga Bolgaria Settlements. Monograph. Kazan: Institute of History of the Tatarstan Academy of Sciences, 2002. – 232 p.

The book was written by a senior researcher of the National Center for Archaeological Studies of the Sh. Marjani Institute of History of the Tatarstan Academy of Sciences of the basis of the archaeological studies of the 10th - early 15th century Volga Bolgaria fortifications. It is the first work to reflect the complex of fortifications types and their evolution over several centuries, and features numerous reconstructions related to specific sites of Bolgar settlement.

This work is intended for archaeologists, historians and a wide range of readers interested in the history of military art.