Gaya APA

Labolo, M., Winarno, . (2015). IELTS preparation : lets get the highest score for IELTS . Jakarta: Pustaka Baru Press.

Gaya MLA

Labolo, Muhadam., Winarno, . "IELTS preparation : lets get the highest score for IELTS". Jakarta: Pustaka Baru Press, 2015. Text.