Gaya APA

Zwier, L, S, , A, L. (2014). 400 Must-Have Words for the TOEFL (2). USA: McGraw-Hill Book Company.

Gaya MLA

Zwier, Lynn, Stafford-Yilmaz, , And, Lawrence. "400 Must-Have Words for the TOEFL". 2 USA: McGraw-Hill Book Company, 2014. E-Book.