APA (7e ed.) Bronvermelding

Sharpe, P. J. (2020). Barron's toefl ibt: With 8 online practice tests (Seventeenth edition.). Barron's.

Chicago (17e ed.) Bronvermelding

Sharpe, Pamela J. Barron's Toefl Ibt: With 8 Online Practice Tests. Seventeenth edition. New York, NY: Barron's, 2020.

MLA (9e ed.) Bronvermelding

Sharpe, Pamela J. Barron's Toefl Ibt: With 8 Online Practice Tests. Seventeenth edition. Barron's, 2020.