Gaya APA
R., P., P., Hastu, S., O. (2006, 2007).
30 (tigapuluh) menit essay writing: writing is easy (Ed.1).
:
Erlangga.
Gaya MLA
Pramono, Peni, R.., Sudiarto, Oktaviani, Hastu.
"30 (tigapuluh) menit essay writing: writing is easy".
Ed.1
:
Erlangga,
2006, 2007.
Textbook.