1943-04-01 | Berry, Burton Y. | Republic of Bulgaria
National Archives and Records Administration II, RG 59 - Records of the Department of State relating to internal affairs of Bulgaria 1910-1944, Washington, D.C. 1982 (Microfilm): Doc. 874.4016/[no number], p. 1. 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.