Raper, C. L. (1906). The principles of wealth and welfare: Economics for high schools. The Macmillan Company.
Cita Chicago (17th ed.)Raper, Charles Lee.. The Principles of Wealth and Welfare: Economics for High Schools. New York: The Macmillan Company, 1906.
Cita MLA (9th ed.)Raper, Charles Lee.. The Principles of Wealth and Welfare: Economics for High Schools. The Macmillan Company, 1906.
Atenció: Aquestes cites poden no estar 100% correctes.