Case, K. E. (2007). Principles of economics. Upper Saddle River, NJ: Pearson/Prentice Hall.
Dyfyniad Arddull ChicagoCase, Karl E. Principles of Economics. Upper Saddle River, NJ: Pearson/Prentice Hall, 2007.
Dyfyniad MLACase, Karl E. Principles of Economics. Upper Saddle River, NJ: Pearson/Prentice Hall, 2007.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.