Gaya APA

GROTH, C, [., LEO, S, [. (2013). ESSAY Writing english for academic purposes : (2 th.ed). Yogyakarta: Andi Offset.

Gaya MLA

GROTH, Cherly, [ed.]., LEO, Sutanto, [dkk]. "ESSAY Writing english for academic purposes :". 2 th.ed Yogyakarta: Andi Offset, 2013. Buku.