Gaya APA

Lougheed, L. (). IELTS: Internastional English Language Testing System / Lin Lougheed (Ed. 2. Cet. 1). Tangerang: Binarupa Aksara.

Gaya MLA

Lougheed, Lin. "IELTS: Internastional English Language Testing System / Lin Lougheed". Ed. 2. Cet. 1 Tangerang: Binarupa Aksara, . Text.