Guell, C. R. (2007). Issues in economics today. Boston: McGraw-Hill/Irwin.
Trích dẫn kiểu ChicagoGuell, C. Robert. Issues in Economics Today. Boston: McGraw-Hill/Irwin, 2007.
Deismireacht MLAGuell, C. Robert. Issues in Economics Today. Boston: McGraw-Hill/Irwin, 2007.
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