APA Style

Ottway, T., Norris, L. (2013). English Elevator International : Student Book . : PT. ASTA ILMU SUKSES.

MLA Style

Ottway, Tom., Norris, Lucy. "English Elevator International : Student Book". : PT. ASTA ILMU SUKSES, 2013. Buku Pengayaan Khusus Siswa.