ETS. (2021). The Official Guide th the TOEFL i BT. McGrawhill.
Chicago-čujuhus (17. p.)ETS. The Official Guide Th the TOEFL I BT. New York: McGrawhill, 2021.
MLA-čujuhus (9. p.)ETS. The Official Guide Th the TOEFL I BT. McGrawhill, 2021.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.