Gaya APA

PURWANINGSIH, ., YENNI, . (2017). BUKU PINTAR IELTS/INSTITUTE OF ENGLISH LANGUAGE TRAINING . YOGYAKARTA: B FIRST.

Gaya MLA

PURWANINGSIH, ., YENNI, . "BUKU PINTAR IELTS/INSTITUTE OF ENGLISH LANGUAGE TRAINING". YOGYAKARTA: B FIRST, 2017. Text.