Cita APA

Duffy, C. B. (1998). The Heinemann ELT TOEFL practice tests. Oxford: McMillan.

Chicago Style Citation

Duffy, Carolyn B. The Heinemann ELT TOEFL Practice Tests. Oxford: McMillan, 1998.

Cita MLA

Duffy, Carolyn B. The Heinemann ELT TOEFL Practice Tests. Oxford: McMillan, 1998.

Atenció: Aquestes cites poden no estar 100% correctes.