Spencer, Herbert. Study of Sociology. 431 pp. Appleton. N.Y., 1880.

[12.]

Schirmacher, Käthe. Das Rätsel: Weib. 160 pp. A Duncker. Weimar, 1911.

[13.]

Ward, Lester F. Psychic Factors in Civilization. 369 pp. Ginn & Co., Boston and New York, 1906. Chap. XXVI.

—— Pure Sociology. 607 pp. Macmillan. N.Y., 1903.

[14.]