From The Art of Star Trek : Judith & Garfield Reeves-Stevens
From Lost Voyages of Trek and the Next Generation : Bill Planer
I'm pretty sure Shatner talks about it in Star Trek Movie memories too, but I can't seem to find the book at the moment. He mentions Sulu losing his legs and Kirk getting his "brain seared" (discussed above).
Sorry if the photo's are a bit big, biggles
. I'll turn them into links if you want.