Additional management resources (likely to include advice about working with boards) are linked in the folder called "What IS an NPO?" The links for board manuals were contributed by Mary Alice Berg.
Their motto is "Building Effective Nonprofit Boards. "Formerly was the National Center for Nonprofit Boards.
UWM portal says it's the best source for "everything board."
This is an example of a complete Board Orientation Manual for a hospital. (Not all hospitals are nonprofit, but this one is.)
This Web page, also from the Ginsler site, downloads into an Adobe PDF that gives an outline of sorts for creating a manual, including headings and descriptions of what should be on each page.