Gaya APA
Widiatrini, R.
(2009).
125 Pertanyaan seputar Microsoft Office Excel 2007
.
Yogyakarta:
Gava Media.
Gaya MLA
Widiatrini, Ratih.
"125 Pertanyaan seputar Microsoft Office Excel 2007".
Yogyakarta:
Gava Media,
2009.
Book.