Dyfyniad APA

Educational Testing Service. (2007). The official guide to the new toefl ibt. McGraw-Hill.

Dyfyniad Arddull Chicago

Educational Testing Service. The Official Guide to the New Toefl Ibt. New York: McGraw-Hill, 2007.

Dyfyniad MLA

Educational Testing Service. The Official Guide to the New Toefl Ibt. McGraw-Hill, 2007.

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