APA-čujuhus (7. p.)
Gregory, P. R. (1990). Essentials of economics (2nd ed.). Scott, Foresman.
Chicago-čujuhus (17. p.)
Gregory, Paul R. Essentials of Economics. 2nd ed. Glenview, Ill.: Scott, Foresman, 1990.
MLA-čujuhus (9. p.)
Gregory, Paul R. Essentials of Economics. 2nd ed. Scott, Foresman, 1990.
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