Dyfyniad APA

(2005). TeacherWorks: Economics principles & practices. New York: McGraw-Hill.

Dyfyniad Arddull Chicago

TeacherWorks: Economics Principles & Practices. New York: McGraw-Hill, 2005.

Dyfyniad MLA

TeacherWorks: Economics Principles & Practices. New York: McGraw-Hill, 2005.

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