Karl Strupp: Urkunden zur Geschichte des Völkerrechts. BandII. Friedrich Andreas Perthes, Gotha 1911, Unabhängigkeitserklärung Bulgariens. Proklamation des Fǖrsten Ferdinand vom 22 September/5 Oktober 1908 (archive.org).
Frank Umbach: Das rote Bündnis. Entwicklung und Zerfall des Warschauer Paktes 1955 bis 1991. Links Verlag, Berlin 2005, ISBN 3-86153-362-6, S. 183.
government.bg
archives.government.bg
Пътеводител по фондовете на БКП, съхранявани в Централен държавен архив, 2. Ausgabe, Zentraler Staatsarchiv beim bulgarischen Ministerialrat, 2006, S. 169, PDF
holocaustresearchproject.org
The fate of the Bulgarian Jews. Bericht des Projekts Holocaust Education & Archive Research Team (H.E.A.R.T.),. Abgerufen am 13. Februar 2023: „The German officer who was in charge of the third transport described the journey:“
jstor.org
Andrew Rossos: The British Foreign Office and Macedonian National Identity, 1918–1941, In. Slavic Review, Vol. 53, No. 2 (Summer, 1994), S. 369–394, Online-Version
vlg. Duncan M. Perry: The politics of terror: the Macedonian liberation movements, 1893–1903. Duke University Press, Durham 1988, ISBN 0-8223-0813-4, S. 34; und Simeon Radew: Die Erbauer/Schöpfer des modernen Bulgariens. Band 1 (1910), Band 2 (1911) und Band 3 (2008) (bulg. Строителите на съвременна България.); und Krum Blagov: Die 50 größten Attentate in der bulgarischen Geschichte (bulg. 50-те най-големи атентата в българската история.) Auszüge aus dem Buch (bulgarisch)
Holocaust – Bulgarian Jews spared. In: The Strange Side of Jews Histor. 18. Dezember 2012, abgerufen am 13. Februar 2023 (englisch, Sources – Dokumentarfilm: The Optimists, directed by Jacky and Lisa Comforty; Saving the Bulgarian Jews in World War II, by Christo Boyadjieff; A Report on the Banality of Evil by Hannah Arendt, Viking Press 1970. Articles: Who Saved the Jews in Bulgaria during WWII? and The Rescue of the Bulgarian Jews): „It was impossible to intercede because the measures were taken suddenly, surprising everybody. By the time the Bulgarian people learned about them, it was too late. The special trains were already arriving in Lom. The political influence of the Bulgarian people had not reached the newly liberated regions… the deportation was carried into effect by German agents“
Christian Geiselmann (PDF; 2,6 MB): Politisches Leben in der bulgarischen Dorfgesellschaft 1919–1944, Am Beispiel der Memoiren des Stefan Rajkov Canev aus Văglevci. S. 33.