States with Neutral Citation systems
In the format yyyy state abbreviation + (where necessary) abbreviation for a higher court (eg App) + unique case number [at paragraph number]
Colorado, Maine, Montana, New Mexico, North Dakota, Oklahoma, South Dakota, Utah, Vermont, Wisconsin, and Wyoming
From 2009 on Arkansas has this form for appellate decisions, but retains page numbers within the court-released pdf file as the means for pinpoint cites.
Illinois, Louisiana, Mississippi, and Ohio have adopted different systems: keep up to date via link below: