Walkenbach, J. (2016) Microsoft® Excel® 2016 bible. Indianapolis, IN: Wiley.
Walkenbach, J. and Knovel (2016) Microsoft® Excel® 2016 bible. Indianapolis, IN: Wiley. Available at: http://0-app.knovel.com.wam.city.ac.uk/web/toc.v/cid:kpMEB00001/viewerType:toc/root_slug:microsoft-excel-2016?kpromoter=federation.
Winston, W.L. (2016) Microsoft Excel 2016 data analysis and business modeling. [New edition]. Redmond, Washington: Microsoft Press, a division of Microsoft Corporation.