If you select the ? tool, and click on the Summary Statistics Table Box, a Help screen will be displayed. Scrolling down the page shows the information on the Robust Standard Deviation
Clicking on that link displays the reference
Huber, P. J., and Ronchetti, E. M. (2009). Robust Statistics. 2nd ed. New York: John Wiley & Sons.
You can also search the Statistics Index
Help=>Statistics
Search on Robust Standard Deviation and it will bring up
If you click on the Help Topic it will bring you to the save help screen shown above.
Jim