APA Citation

 Frye, C. (2013).  Microsoft Excel 2013: Step by step.  Microsoft.

Chicago Style Citation

 Frye, Curtis.  Microsoft Excel 2013: Step By Step.  Microsoft, 2013.

MLA Citation

 Frye, Curtis.  Microsoft Excel 2013: Step By Step.  Microsoft, 2013.

Warning: These citations may not always be 100% accurate.