The following formula is involved in the calculation of alpha values:

Alpha value:
where B is the security's beta value, MR is the security's market return, and RFR is the riskfree rate of return.

The following references can be used to cite this alpha value calculator:
 Soper, D.S. (2017) "Alpha Value Calculator (Online Software)", http://www.danielsoper.com/fincalc. 
 Siegel, J. and Shim, J. (1997). "Schaum's Quick Guide to Business Formulas", New York, NY: McGrawHill. 