1. T. Hutchinson, ?William Stanley Jevons?, in D. S. Sills (ed.), Encyclopedia of the Social Sciences, 8, Macmillan and Free Press, New York, 1969. pp. 254?260.
2. G. Stigler, ?Henry L. Moore?, in D. S. Sills (ed.), Encyclopedia of the Social Sciences, 10, Macmillan and Free Press, New York, 1969, pp. 479?481.
3. E. Huntington, The Pulse of Asia, Houghton Mifflin, Boston, 1907, 415 pp.
4. E. Huntington, Mainsprings of Civilization, Wiley, New York, 1945, 660 pp.
5. C. E. P. Brooks, Climate Through the Ages, Dover, New York, 1949, 395 pp.