1. Arambourg, C., Actes du Congres Panafricain de Prehistoire, 1952: 281 (1955).
2. The Old Stone Age in the Anglo-Egyptian Sudan 1949
3. PERSONAL COMMUNICATION
4. Balout, L., Prehistoire de l'Afrique du nord: 269 (1955).
5. Balout L. paper presented before the 5th Pan-African Congress on Prehistory (1963).