The following formula is involved in the calculation of acidtest (quick) ratios:

Acidtest (quick) ratio::
where C is a company's cash on hand, S is the company's market security holdings, AR is the accounts receivable balance, and L is the company's current amount of liabilities.

The following references can be used to cite this acidtest (quick) ratio calculator:
 Soper, D.S. (2018) "AcidTest (Quick) Ratio 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. 