Dyfyniad APA

Guell, R. C., & Robert C. Guell. (2010). Issues in economics today. Boston: McGraw-Hill/Irwin.

Dyfyniad Arddull Chicago

Guell, Robert C., và Robert C. Guell. Issues in Economics Today. Boston: McGraw-Hill/Irwin, 2010.

Dyfyniad MLA

Guell, Robert C., và Robert C. Guell. Issues in Economics Today. Boston: McGraw-Hill/Irwin, 2010.

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