Tolong jelaskan mengenai Bacaan tambahan dari Pierre Guillaume Frédéric le Play

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Healy, Mary Edward (1947). "Le Play's Contribution to Sociology: His Method," The American Catholic Sociological Review 8 (2), pp. 97–110.

Herbertson, Dorothy (1920). "Le Play and Social Science," The Sociological Review 12 (2), pp. 108–110.

Higgs, Henry (1890). "Frédéric Le Play," The Quarterly Journal of Economics 4 (4), pp. 408–433.

Pitt, Alan (1998). "Frédéric Le Play and the Family: Paternalism and Freedom in the French Debates of the 1870s," French History 12 (1), pp. 67–89.

Rousiers, Paul De (1894). "La Science Sociale," Annals of American Academy of Political and Social Science 4 (4), pp. 128–154.

Sorokin, Pitirim A. (1928). "Frederic Le Play's School." In: Contemporary Sociological Theories, New York: Harper, pp. 63–98.

Swinny, S. H. (1921). "The Sociological Schools of Comte and Le Play," The Sociological Review 13 (2), pp. 68–74.

Zimmerman, Carle Clark (1935). "Le Play Theories." In: Family and Society. New York: D. Van Nostrand Company, Inc., p. 71.