[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.