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.
Archivio Storico Diplomatico del Ministero degli Affari Esteri, AG Uff IV. Posizione S.E. 27.869, busta R, fasc. Romania, copy: busta 17 (1941-1942). Original in Italian.