Gaya APA

Leo, S., Groth, C. (2013). Essay Writing English For Academic Purposes : with Exercises and Answer Key (Second edition). Yogyakarta: Andi Offset.

Gaya MLA

Leo, Sutanto., Groth, Cheryl. "Essay Writing English For Academic Purposes : with Exercises and Answer Key". Second edition Yogyakarta: Andi Offset, 2013. Buku Tex.