HUBBARD, R. G. (2017). Economics. Pearson Education.
Chicagoスタイル(17版)引用形式HUBBARD, R. Glenn. Economics. Pearson Education, 2017.
MLA(9版)引用形式HUBBARD, R. Glenn. Economics. Pearson Education, 2017.
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APA(7版)引用形式