Over the last few years, Markus had been working on a PhD thesis with Eelco Visser at the TU Delft. The thesis, called Generic Tools, Specific Languages is about using language workbenches and language engineering to tackle the adaptation of (engineering) tools to specific domains. mbeddr is the the example discussed in the thesis. So in essence, the thesis is more or less an mbeddr book -- at the very least it is the most comprehensive discussion about mbeddr's idea, the implementation and the experiences so far. You can download the PDF version from Markus' website (click on the cover). A printed version will be available in the future.