Civilization, p. 228. Translated by J. E. Stapleton Driver. Stanford University Press, Stanford, California. ISBN 0-8047-0806-1 (cloth); ISBN 0-8047-0901-7 (paper)
Sampson, Geoffrey. Writing Systems: A linguistic introduction, pp. 94–95. Stanford, California: Stanford University Press, 1985. ISBN 0-8047-1254-9. x字高 降部
Civilization, p. 228. Translated by J. E. Stapleton Driver. Stanford University Press, Stanford, California. ISBN 0-8047-0806-1 (cloth); ISBN 0-8047-0901-7 (paper)