APA aipamena

(2017). TOEFL iBT prep plus 2018-2019: 4 practice tests + proven strategies + online + audio. New York: Kaplan Publishing.

Chicago Style aipamena

TOEFL IBT Prep Plus 2018-2019: 4 Practice Tests + Proven Strategies + Online + Audio. New York: Kaplan Publishing, 2017.

MLA aipamena

TOEFL IBT Prep Plus 2018-2019: 4 Practice Tests + Proven Strategies + Online + Audio. New York: Kaplan Publishing, 2017.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.