Project Management Bookclub discussion

I have been teaching PM at an online college for 10 years now and have added a lecture in one of my courses about Project Governance. I reference Project Governance by Ralf Miller in my lecture because i have read it and really couldn't find any other better books on the topic. Although the course has had some discussions about it, I was wondering if anyone here has read any other better books on project governance to give a Masters level student a better understanding of what it is. Please post the book title and author so I can check it out.
Thanks!