Gaya APA
Microsoft Excel 2007 Level 1. (2007).
New York:
[s.n.].
Gaya Chicago
Microsoft Excel 2007 Level 1.
1.
New York:
[s.n.],
2007.
Text.
Gaya MLA
Microsoft Excel 2007 Level 1.
1.
New York:
[s.n.],
2007.
Text.
Gaya Turabian
Microsoft Excel 2007 Level 1.
New York:
[s.n.],
2007.
Print.