APA ציטוט

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

Trích dẫn kiểu Chicago

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

ציטוט MLA

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