Speaking Secrets of the Masters: The Personal Techniques Used by 22 of the World's Top Professional Speakers Paperback – 31 December 2015

You must get this book. There's a ton of tips here not covered in any regular speech textbooks.

This was a little outdated since it was written in the 90s, and it started getting repetitive toward the end, but as someone trying to improve their speaking skills, I found a lot of helpful tips in this book

I selected the book because it was either recommended or I enjoyed the synopsis. The book is for self development. It is a great book to read to expand knowledge.