Faranse wa "sii" ati "wa" lati lo siwaju lori atunse ti ifowosowopo owo ni Central Africa, gegebi o ti ni anfani lati waye ni Iwo-oorun Afirika.. 
Crook, Law and Life of Rome, 90 BC-AD 212, 1967, ISBN0-80-14-273-4 Donald R.. 