One of the best, clear and well written texts out there for Regression!
I co teach a course in Statistics / Regression to Post Doctoral students.
The excellent book by Miles and Shevlin is one of the 2texts that are required reading for the course.
Clearly written, with useful tables, annotated SPSS output and data sets on line.
A real gem.
For aspiring leaders, who are interested in understanding either how to better lead their teams or why they're stumbling, this a great place to start.  It is an easily digested survey across a field that does not come intuitively to many leaders.  It points the way to deeper study as needed to improve understanding and performance in specific areas, based on the original ideas and in the words of thought leaders across this field of study.

Rather than trying to reinvent the wheel -- or figure these theories out for ourselves -- start with this book and jump directly to heart of your team's problems.