APA Style

Betsis, A., Mamas, L. (2011). Succeed In IELTS: Self-Practise, Authentic Test Format, Practical Usage (First Pub.). Jakarta: Penerbit Erlangga.

MLA Style

Betsis, Andrew., Mamas, Lawrence. "Succeed In IELTS: Self-Practise, Authentic Test Format, Practical Usage". First Pub. Jakarta: Penerbit Erlangga, 2011. .