A letter of authority is a document within the probate process that gives the personal representative the fiduciary the person in charge. "Letters of Office" is not really a letter.Citing legal and government sources ; In the citation above, Herring is the plaintiff, New York is the defendant. The end result of all those additional pages and content is more guidelines, examples and authority. Some businesses (like hotels) usually have their own credit authorization forms. In this case, all you need to do is fill them out! This resource contains the Notes and Bibliography (NB) sample paper for the Chicago Manual of Style 17 th edition. If it is different from that listed in the first reference.