Bryant, C.C. (2007). Prague in black: Nazi rule and Czech nationalism, Harvard University Press, ISBN 0-674-02451-6, p. 125
Hans Rudolf Fuhrer (1982). Spionage gegen die Schweiz. Huber. p. 68. ISBN 3-274-00003-5.
Jeremy Noakes, Geoffrey Pridham (1995). Nazism, 1919-1945: Foreign policy, war and racial extermination. University of Exeter Press. p. 882. ISBN 0-85989-474-6.
↑ Bryant, C.C. (2007). Prague in black: Nazi rule and Czech nationalism, Harvard University Press, ISBN 0-674-02451-6, p. 125
