Kalcho Kalchev

• Besarabski Bŭlgari opŭlchent͡s︡i v rusko-turskata voĭna, 1877-1878 g
• Bŭlgarii︠a︡
• Bŭlgaro-turski voennopoliticheski otnoshenii︠a︡
• Bŭlgaro-turski voennopoliticheski otnoshenii︠a︡
• Bŭlgaro-turski voennopoliticheski otnoshenii︠a︡
• Bŭlgaro-turski voennopoliticheski vrŭzki i otnoshenii︠a︡
• Bŭlgarskata etnicheska obshtnost v Besarabii︠a︡ (XIX-XX v.)
• General Danail Nikolaev
• Istoricheski kalendar za besarabskite bŭlgari
• Planirane na sot︠s︡ialisticheskoto selsko stopanstvo
• The state policy for the development of Bulgarian agriculture
• Uvod v istoricheskoto poznanie