"TED Talks: The Official TED Guide to Public Speaking" https://smile.amazon.com/TED-Talks-Official-Public-Speaking-...

TED Masterclass: https://masterclass.ted.com/

"Power Talk: Using Language to Build Authority and Influence" https://smile.amazon.com/Power-Talk-Language-Authority-Influ...

Re: Clean Language and Symbolic Modeling; listening to metaphors and asking clean questions may be a more effective way to facilitate change: https://westurner.github.io/hnlog/#comment-15471868