I want to highlight cells that have a formula in them that is referencing a specific worksheet…?

For example, a column of cells is as follows:

A1 25
A2 £300
A3 =Data!E3
A4 =A1*A2
A5 75
A6 =Data!E7

I would want to highlight only cells A3 and A6 that lookup the "Data" worksheet. Obviously use conditional formatting, but not sure on the formula to use...?

Any help much appreciated.

Cheers, PM.