Jean Cuny's French book on German nightfighters is quite good!
 

I bought Jean Cuny's book on e-bay from Spain, after a search for 5 years. I was amazed at how well written and produced the book is despite it coming out in the early 1980s. I had seen it at a bookstore in London 10 years ago, but did not buy it to my regret because I thought the price steep (35 pounds). It has sections on the german and allied nightfighters, radars, equipment, and weapons. A lot of large BW photographs, line drawings, and colour profiles. It is not in the calibre of classic publications jagdwaffe, but I would compare it favourably with A. Price's Battle over the Reich (early edition). Of course some basic understanding of French is needed. If you come across it, don't hesitate to buy it.