Both the Publication Manual of the American Psychological Association and The Bluebook Manual of Legal Citation indicate that state statutes (laws that have been passed and added to the state code), should be cited to the code.
Try searching the state name and the term "code" or "laws" to find online versions of the state codes. State codes are organized differently in every state.
This Basic Legal Citation guide, produced by the Cornell Legal Information Institute is a very good source for state code names/abbreviations.
See: Cornell's Legal Information Institute, Basic Legal Citation, for a list of Code abbreviations and sample citations, by state.
Note: APA style calls for the title of the statute to precede information on the source.