Dyfyniad APA

Guell, R. C., & 1906-1998. (2011). Issues in economics today (6th ed.). Dubuque: McGraw-Hill.

Dyfyniad Arddull Chicago

Guell, Robert C., và 1906-1998. Issues in Economics Today. 6th ed. Dubuque: McGraw-Hill, 2011.

Dyfyniad MLA

Guell, Robert C., và 1906-1998. Issues in Economics Today. 6th ed. Dubuque: McGraw-Hill, 2011.

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