I've been using these books for a while now, one for several years and the other for about a month:
Page, Dr. David. Body Trauma. CA: Behler
publications, 2nd ed. 2006.
I have several books in this series like Deadly Doses and Cause of Death. Best simple resource on how to injure people realistically in fiction. Also its much better written and is an enjoyable read, unlike the others, largely due to the author. I have lots of 'how to write' books and like the readable ones best.
I've used this for years, but I recently had to pick up a new copy because my old one is stuck back in the States. They've updated it since its last printing. with more juicy (or gory) tidbits.
Wilson, Dr. Keith and Dr. David Page. Code Blue. Writer's Digest Books, 2000.
Got this one cause I had the other. Unfortunately I think its dropped out of print and good luck finding one. I took one of the few being resold on Amazon.
While Body Trauma is a good handbook for all writers who may ever have to injure or kill off a character on the page, this book is a great resource for anyone who ever contemplates writing about doctors. Its got lots of interesting bits on how doctors are educated, how hospitals work, how records are handled etc... The best part is that the authors actually suceed in making what sounds like very dry info actually readably interesting (if you like medical stuffs that is), probably because its one of the same guys who did the previous book. The book also points you in all sorts of directions as to where the ethical and interpersonal conflicts are likely to be (plot opportunities, anyone?)
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But I can't always talk to them the instant I think of something (half a world away!) so the paper resources come in handy too.