Gaya APA
WIDYANINGRUM, R, [.
(2007).
MICROSOFT excel 2007 :
.
Jakarta:
Salemba Infotek.
Gaya MLA
WIDYANINGRUM, Resthi, [ed.].
"MICROSOFT excel 2007 :".
Jakarta:
Salemba Infotek,
2007.
Buku.