The three NOLO books below are very helpful and are written for non-lawyers but they are not about New Hampshire law. Use them as introductions to the topic, then take a look at New Hampshire resources.
Please remember that this guide is for information purposes only and is not comprehensive. It is intended as a starting point for research, to illustrate the various sources of the law, and to provide guidance in their use. NH Law About ... is not a substitute for the services of an attorney.