Arnold, R. A. (2020). Economics (13th ed.). Cengage Learning.
Chicagoスタイル(17版)引用形式Arnold, Roger A. Economics. 13th ed. Boston, MA: Cengage Learning, 2020.
MLA(9版)引用形式Arnold, Roger A. Economics. 13th ed. Cengage Learning, 2020.
警告: この引用は必ずしも正確ではありません.