There are two primary schools of thought when it comes to document style. Chicago and AP.
Since most legal documents are apparently mostly compatible with the Chicago I end up using that for my own work.
However, most press work seems to fall under the AP style guide. AP even has an app called StyleGuard.
If you are curious about some of the variances, I will list a couple.
|Lists||Bob, Bill, Barb, and Betty||Bob, Bill, Barb and Betty||No comma after Barb|
||Don’t use the AP.|
|URL||CMOS||APSB||Don’t use AP.|