Gaya APA
Pramono, P, R., Sulistyo, U. (2007).
F5 giant steps to successful business writing (1).
Yogyakarta:
Andi Offset.
Gaya MLA
Pramono, Peni, R.., Sulistyo, Ule.
"F5 giant steps to successful business writing".
1
Yogyakarta:
Andi Offset,
2007.
Buku Pend. Bahasa Inggris.