Yep, The Language of Electroacoustic Music is one I've been reading quite a bit lately.
Trevor Wishart's Audible Design listed in that link is another I picked up and seems like a great look into his processes.
Also his On Sonic Art and the more recent Sound Composition.
I live in the academic music theory world and I see a real need for an electroacoustic music theory text that is technology agnostic and can introduce otherwise trained musicians in the most relevant and utilized techniques. I'm hoping this book gets close to that.