AYRES C. E., The Theory of Economic Progress. Chapel Hill: University of North Carolina Press, 1944.
BEARD C. A., "Written History as an Act of Faith", The American Historical Review, January, 1934, Vol. XXXIX.
CASSIRER E., Substance and Function, and Einstein's Theory of Relativity. Chicago: The Open Court Publishing Company, 1923.
CHAMBERLIN E. H., The Theory of Monopolistic Competition, Third Edition. Cambridge: Harvard University Press, 1938.
CLARK J. B., "Patten's Dynamic Economics", The Annals of the American Academy of Political and Social Science, July, 1892, Vol. 3.
EDDINGTON A. S., The Nature of the Physical World. New York: The Macmillan Company, 1928.
ELY R. T., "The Past and the Present of Political Economy", Johns Hopkins University Studies in Historical and Political Science, Second Series, III, 1884.
GARVER F. B., and HANSEN A. H., Principles of Economics, Revised Edition. New York: Ginn and Company, 1937.
HAMILTON W. H., "The Development of Hoxie's Economics", The Journal of Political Economy, November, 1916, Vol. XXIV.
------, "The Place of Value Theory in Economics", The Journal of Political Economy, March, 1918, Vol. XXVI.
------, "The Institutional Approach to Economic Theory", The American Economic Review, March, 1919, Vol. IX.
HOXIE R. F., "Sociology and the Other Social Sciences: a Rejoinder", The American Journal of Sociology, 1907, Vol. XII.
JAMES E. J., "The State as an Economic Factor", Science-Economic Discussion. New York, 1886.
JEVONS W. S., The Principles of Science, Second Edition. London: Macmillan and Co., Ltd., 1924.
LÖWE A., Economics and Sociology. London: G. Allen and Unwin, Ltd., 1935.