Sua sponte reports that there is a California Manual of Style, but actually in a law firm everything is done by macros.
bq. And a good thing, too: the format is just different enough from ALWD to be pesky, gnatlike. Where you’d expect
People v. Price, 4 Cal.App.3d 941 (1970)
doin’ it California Style yields
People v. Price (1970), 4 Cal.App.3d 941Here is the manual, currently not available.
Or you can get LexisNexis CiteRite II and the software will check your citations, either according to the Bluebook or according to the California style.