For the beginner, we recommend this excellent article on how to research local government law (written by a BYU law librarian):
Shawn G. Nevers, "Local Ordinances: The Often Overlooked Laws," Student Lawyer, Feb. 2014, http://ssrn.com/abstract=2449546
For more advanced treatment, see the following treatises (and those listed elsewhere in this research guide):
These are resources to which the Hunter Law Library or the Harold B. Lee Library has purchased a subscription. Most subscription licenses require off-campus access to be limited to BYU law students and faculty. Other patrons are welcome to use many of these resources by visiting the library premises.