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Dan Roam's book "The Back of the Napkin" (he has at least 5 books on the topic of visual thinking for various applications)
If you need to explain something, at least a napkin is always at hand.
Then that's what this book is about - how to enhance what you're telling when drawing, using what's available (even just a napkin)
A simply written book, as a teaching lecture. I recommend. This is one of those books that can be revisited over and over again.