[29] Appleton's New Practical Encyclopedia.
[30] Chambers' Encyclopedia.
[31] The Americana.
[32] Encyclopedia Britannica (Eleventh Edition).
[33] Conquest of Mexico, Vol. 1, p. 102.
[34] Monument Facts, Etc., pp. 37-40.
[35] The Code of Hammurabi, R. F. Harper, Ph.D.
[36] Encyclopedia Britannica (Eleventh Edition).
[37] The Dwellers on the Nile, p. 41.
[38] Childhood of the World, p. 13.