Gaya APA

Ottoway, T, D, L, N. (2013). English Elevator International Intro (Workbook) . : PT Astra Ilmu Sukses.

Gaya MLA

Ottoway, Tom, Dan, Lucy, Norris. "English Elevator International Intro (Workbook)". : PT Astra Ilmu Sukses, 2013. teks.