The Little Book of Boards provides a concise and easy-to-read overview of the responsibilities of a board member. It provides an excellent overview of the fiduciary responsibilities of the board and then the further responsibilities of someone who takes a leadership position. Some books were too detailed but this one provided enough context for someone new to a board position.

Nonprofit Management
A few quick thoughts about nonprofits and law
One time as the director of a nonprofit, I received an interesting call from a private investigator. He wanted to serve legal papers to our board