Found in 2 comments on Hacker News
js2 · 2019-09-24 · Original thread
You might be interested in the book “Never Split The Difference” which has been recommended on HN frequently:

https://www.amazon.com/Never-Split-Difference-Negotiating-De...

You might also be interested in looking into nonviolent communication.

js2 · 2019-03-26 · Original thread
The book “Never Split the Difference” was recommended on HN recently:

https://www.amazon.com/Never-Split-Difference-Negotiating-De...