APA Citation

(1989). Understanding TOEFL: An official TOEFL study aid. Princeton: Educational testing service.

Chicago Style Citation

Understanding TOEFL: An Official TOEFL Study Aid. Princeton: Educational testing service, 1989.

MLA Citation

Understanding TOEFL: An Official TOEFL Study Aid. Princeton: Educational testing service, 1989.

Warning: These citations may not always be 100% accurate.