Multiple Workbook problem

I have this formula in a workbook but now I have to take the worksheet out and make it into its own workbook. I'm having trouble linking the new workbook BrianSummary.xlsx to the original workbook that holds on the data BrianFormulas.xlsx

=SUMPRODUCT(SUMIF(INDIRECT("'"&list&"'!$B$4:$X$4"),B$4,INDIRECT("'"&list&"'!B$14:X$14")))