1. Burgess, E. W., and Cottrell, L. S., Predicting Success or Failure in Marriage. New York: Prentice-Hall, 1939.
2. Davis, Katharine B., Factors in the Sex Life of Twenty-two Hundred Women. New York: Harper and Brothers, 1929.
3. Dickinson, R. L., and Beam, Lura, A Thousand Marriages. Baltimore: Williams and Wilkins, 1931.
4. Hamilton, G. V., A Research in Marriage. New York: Albert and Charles Boni, 1929.
5. Terman, Lewis M., Psychological Factors in Marital Happiness. New York: McGraw-Hill, 1938.
III. CONTRACEPTION AND FAMILY SPACING (Birth control).
1. Cooper, James F., Technique of Contraception. New York: Day-Nichols, 1928.
2. Dickinson, Robert L., Control of Conception. 2nd edition. Baltimore: Williams and Wilkins, 1938.
3. Latz, Leo J., The Rhythm of Sterility and Fertility in Women. 5th edition. Chicago: Latz Foundation, 1935. (Recommended to Catholics.)