Books below are available for sale.

• The Watermarks in the Ottoman Documents v. 2, 2005 by Asparuh VELKOV

• The Watermarks in the Ottoman Documents v. 3, 2007 by Stefan ANDREEV

• Ottoman Turkish Documents About The History of Hungary and the Hungarians: 17th - 19th century; 2013 by Stoyan Shivarov
• Mraka and Radomir During the Middle Ages and the National Revival; 2007 by Georgi KOVATCHEV