Ruggles, R., & Ruggles, N. D. (1956). National income accounts and income analysis (2nd ed.). McGraw-Hill.
Citace podle Chicago (17th ed.)Ruggles, Richard, a Nancy D. Ruggles. National Income Accounts and Income Analysis. 2nd ed. New York: McGraw-Hill, 1956.
Citace podle MLA (9th ed.)Ruggles, Richard, a Nancy D. Ruggles. National Income Accounts and Income Analysis. 2nd ed. McGraw-Hill, 1956.
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