Dyfyniad APA

Guell, R. C. (2007). Issues in economics today (3rd ed.). McGraw-Hill.

Dyfyniad Arddull Chicago

Guell, Robert C. Issues in Economics Today. 3rd ed. Boston, MA: McGraw-Hill, 2007.

Dyfyniad MLA

Guell, Robert C. Issues in Economics Today. 3rd ed. McGraw-Hill, 2007.

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