Comment by perlgeek

"Electronic Transport in Mesoscopic Systems" by Supriyo Datta.

It's a very specific book, but it does explain for example why you can assume that only electrons at the Fermi energy contribute to transport phenomena (aka "current").

I guess for somebody not into mesoscopic transport, only the first three or four chapters will be of interested. But for my diploma thesis (which ended too badly to link it here) it was a real live safer.