Gaya APA
O'leary, T., O'leary, L, I.
(2011).
Microsoft Office 2010 :Excel
.
America:
Mc Graw hill.
Gaya MLA
O'leary, Timothy., O'leary, Linda, I.
"Microsoft Office 2010 :Excel".
America:
Mc Graw hill,
2011.
Text.