Citazione Stile APA (7a Edizione)

ETS. (2021). The Official Guide th the TOEFL i BT. McGrawhill.

Citazione stile Chigago Style (17a edizione)

ETS. The Official Guide Th the TOEFL I BT. New York: McGrawhill, 2021.

Citatione MLA (9a ed.)

ETS. The Official Guide Th the TOEFL I BT. McGrawhill, 2021.