Gaya APA

Purwaningsih, ., Yenni, . (2013). Buku pintar IELTS (Institute of English Language Training) (edisi 1). Yogyakarta: B First.

Gaya MLA

Purwaningsih, ., Yenni, . "Buku pintar IELTS (Institute of English Language Training)". edisi 1 Yogyakarta: B First, 2013. Text.