The cultural development of Bulgaria
Foreign Languages Press, 1959
 Buku Teks SO
Saxena, H.L.
Bulgaria under the red star / H.L. Saxena
S. Chand & Co, 1957
 Buku Teks SO
Pelin, Elin
Short stories / Elin Pelin
Foreign Languages Press, 1965
 Buku Teks SO
Black, C.E.
The Establishment of constitutional government in Bulgaria / C. E. Black
Princeton University press, 1943
 Buku Teks
Moser, Charles A.
Dimitrov of Bulgaria : a political biography of Dr. Georgi M. Dimitrov
Caroline House, 1979
 Buku Teks SO