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What are the good books on negotiation?

I previewed the Trump book and it looked like most stories and musings more than technical explanation.

I've seen Nivi from VentureHacks mention "Bargaining for Advantage" a couple of times - more notable occasion was as this book review: http://venturehacks.com/articles/bargaining-for-advantage

It's quite high up on my current list of "Books to read".