APA-viite (7. p.)

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

Chicago-viite (17. p.)

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

MLA-viite (9. p.)

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