The following formula is involved in the calculation of cash flow from operations to sales ratios
:

Cash flow from operations (CFO) to sales ratio:
where CFO is a company's cash flow from operations and S is the company's sales.

The following references can be used to cite this cash flow from operations (cfo) to sales ratio calculator:
 Soper, D.S. (2018) "Cash Flow from Operations (CFO) to Sales Ratio Calculator (Online Software)", http://www.danielsoper.com/fincalc. 
 Nikolai , L.A., Bazley, J.D., and Jones, J.P. (2009). "Intermediate Accounting", Mason, OH: SouthWestern Cengage. 