共 4 条
[1]
BREASTED JH, 1914, ANCIENT TIMES, P239
[2]
DART RA, 1931, Transactions of the Royal Society of South Africa, V19, P379
[3]
DIXEY F, 1920, MINING MAG, V23, P213
[4]
Ingram James Kells, 1895, A History of Slavery and Serfdom, P154