Gaya APA
Lougheed, L. (2013).
Barron's The Leader in Test Preparation: IELTS Practice Exams (2).
Hauppauge:
Barrons Educational Series.
Gaya MLA
Lougheed, Lin.
"Barron's The Leader in Test Preparation: IELTS Practice Exams".
2
Hauppauge:
Barrons Educational Series,
2013.
Buku.