Girvetz, Harry K. and Minogue Kenneth. Liberalism, Encyclopædia Britannica (online), p. 16, dicatat pada May 16, 2006.
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"assumption about individuals being rational, self-interested and methodical in the pursuit of their goals." Drilane, Robert and Parkinson, Gary. Online Dictionary of the Social Sciences.
...when the growing complexity of industrial conditions required increasing government intervention in order to assure more equal opportunities, the liberal tradition, faithful to the goal rather than to the dogma, altered its view of the state ... there emerged the conception of a social welfare state, in which the national government had the express obligation to maintain high levels of employment in the economy, to supervise standards of life and labor, to regulate the methods of business competition, and to establish comprehensive patterns of social security.. Schelesinger Jr., Arthur. Liberalism in America: A Note for Europeans dari The Politics of Hope, Riverside Press, Boston, 1962
