National Archives and Records Administration II, RG 59 - Records of the Department of State relating to internal affairs of Bulgaria 1910-1944, Washington 1982 (Mikrofilm-Edition): Doc. 874.4016/68, p. 1f. Original in English.
National Archives and Records Administration II, RG 59 - Records of the Department of State relating to internal affairs of 1910-1944, Washington 1982 (Microfilm-Edition): Dokument 874.4016/69, p. 1f. Original in English.