Gaya APA
dkk, S, L., Sudiyarto, O, H. (2007).
English For Acdemic Purpose; Essay Writing (Pertama).
Yogyakarta:
Andi Offset.
Gaya MLA
dkk, Susanto, Leo,., Sudiyarto, Oktaviani, Hastu.
"English For Acdemic Purpose; Essay Writing".
Pertama
Yogyakarta:
Andi Offset,
2007.
Text.