These books are in .pdf format. You'll need the free Adobe Reader to access them. If you don't already have it, you can get it at http://get.adobe.com/reader/ .
These .pdf books also work in eReaders such as the Kindle and the Nook. To use them with an eReader, you need to first download them to your computer and then transfer them to your eReader via the USB port.
Alternatively, you can "Get" the books (except for the Academic Papers) directly to your web browser or eReader from Archive.org - just search for "M. David Johnson" (include the quotes).
Here are the books which I've written so far: