United States. Department of State & United States. National Archives and Records Service. (1967). Records of the Department of State relating to internal affairs of Belgium, 1910-29. National Archives, National Archives and Records Service, General Services Administration.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)United States. Department of State و United States. National Archives and Records Service. Records of the Department of State Relating to Internal Affairs of Belgium, 1910-29. Washington: National Archives, National Archives and Records Service, General Services Administration, 1967.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)United States. Department of State و United States. National Archives and Records Service. Records of the Department of State Relating to Internal Affairs of Belgium, 1910-29. National Archives, National Archives and Records Service, General Services Administration, 1967.