Dyfyniad APA

Gwartney, J. D., Stroup, R., Sobel, R. S., & Macpherson, D. A. (2015). Economics: Private and public choice (15th edition.). Cengage Learning.

Dyfyniad Arddull Chicago

Gwartney, James D., Richard Stroup, Russell S. Sobel, and David A. Macpherson. Economics: Private and Public Choice. 15th edition. Stamford, CT: Cengage Learning, 2015.

Dyfyniad MLA

Gwartney, James D., et al. Economics: Private and Public Choice. 15th edition. Cengage Learning, 2015.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.