We are glad to announce that Tigran Aleksanyan's book "The Study of Medieval Monuments in the Territory of the Khachen Principality" has been published. The book is dedicated to the history of the study of medieval monuments in the territory of Khachen princedom. On the basis of various historical documents, all materials related to the problem, both the work of Armenian and foreign researchers, have been summarized. A separate section also presents brief results of excavations of medieval monuments of the region. The electronic version of the book is available here.