Q. How do I cite the electronic version of Luther's Works on CD-ROM?

For citation purposes it's best to cite as though the print volumes, which remain the standard, have been consulted.

There is a nice feature on both the Luther's Works and Book of Concord results screen that indicates exactly where in the print equivalent the text displayed is from.  It is the icon just to the right of the green/white arrow at the top of the results screen.  It looks like a page of text.  If you hold the mouse over it it says "Active Index".  Click on this icon and you can choose to have displayed the volume and page no. from the print volume(s).