Gaya APA
O'Leary, T, J., O'Leary, L, I.
(2011).
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.
New York:
McGraw-Hill.
Gaya MLA
O'Leary, Timothy, J.., O'Leary, Linda, I..
"Microsoft excel 2010 : a case approach".
New York:
McGraw-Hill,
2011.
Text.