Opfer-Klinger, B. Bulgaria's collaboration with the Axis Powers in World War II. Complicated complicity : european collaboration with Nazi Germany during World War II.

Opfer-Klinger, Björn. "Bulgaria's Collaboration with the Axis Powers in World War II." Complicated Complicity : European Collaboration with Nazi Germany During World War II .

Opfer-Klinger, Björn. "Bulgaria's Collaboration with the Axis Powers in World War II." Complicated Complicity : European Collaboration with Nazi Germany During World War II, .