Extreme Ownership ebook PDF is a good option for a student. Personally I bought a hardcover version, my colleague has also purchased a kindle PDF version. Jocko Willink and Leif Babin is one of my favourite authors from now.
I found this book very helpful - Jocko Willink and Leif Babin is a great teacher and writer. Probably Extreme Ownership is the one of the best on the topic
It is a comprehensive (really) book - Extreme Ownership by Jocko Willink and Leif Babin really helps you to understand the topic