Cita APA (7th ed.)

(1989). Understandig TOEFL study aid (3rd ed.). ETS.

Cita Chicago (17th ed.)

Understandig TOEFL Study Aid. 3rd ed. NewYork: ETS, 1989.

Cita MLA (9th ed.)

Understandig TOEFL Study Aid. 3rd ed. ETS, 1989.

Atenció: Aquestes cites poden no estar 100% correctes.