Select a single cell or a range of cells; use Ctrl to select several non-adjacent cells:
Click the Copy Address icon in the Utilities group on the Ablebits Tools tab:
The range reference is copied and can be pasted into any cell of your choice:
If you want to copy the address with its external and/or absolute reference, under Copy Address, select the option you need in the dropdown list:
To refer to the cell content from another workbook, select As External Reference in the list and paste the result to the needed place:
If you want a reference to stay fixed on a specific cell or range, copy the absolute reference address to clipboard by picking the As Absolute Reference option:
Choose to copy the range address As External and Absolute Reference to refer to specific cells and include Excel file and sheet names: