Goldberg, S. (1958). Introduction to difference equations, with illustrative examples from economics, psychology, and sociology. Wiley.
Lua i Stíl Chicago (17ú heag.)Goldberg, Samuel. Introduction to Difference Equations, with Illustrative Examples from Economics, Psychology, and Sociology. New York: Wiley, 1958.
Lua MLA (9ú heag.)Goldberg, Samuel. Introduction to Difference Equations, with Illustrative Examples from Economics, Psychology, and Sociology. Wiley, 1958.
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