The cultural development of Bulgaria
Foreign Language Press, 1959
Buku Teks SO
Saxena, H.L.
Bulgaria under the red star / H.L. Saxena
S. Chand & Co, 1957
Buku Teks SO
Moser, Charles A.
Dimitrov of Bulgaria : a political biography of Dr. Georgi M. Dimitrov
Caroline House, 1979
Buku Teks SO
MacDermott, Mercia
The apostle of freedom : a portrait of Vasil Levsky against a background of nineteenth century Bulgaria / Mercia MacDermott
Sofia Press, 1979
Buku Teks SO