Welch, P. J., & Welch, G. F. Economics: Theory and practice (5th ed.). Dryden.
Chicagoスタイル(17版)引用形式Welch, Patrick J., , Gerry F. Welch. Economics: Theory and Practice. 5th ed. Chicago: Dryden.
MLA(9版)引用形式Welch, Patrick J., , Gerry F. Welch. Economics: Theory and Practice. 5th ed. Dryden.
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