Educational Testing Service. (2007). The official guide to the new toefl ibt. McGraw-Hill.
Chicago-čujuhus (17. p.)Educational Testing Service. The Official Guide to the New Toefl Ibt. New York: McGraw-Hill, 2007.
MLA-čujuhus (9. p.)Educational Testing Service. The Official Guide to the New Toefl Ibt. McGraw-Hill, 2007.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.