California Code, Government Code - GOV § 81012

(a) This title may be amended to further its purposes by statute, passed in each house by rollcall vote entered in the journal, two-thirds of the membership concurring and signed by the Governor, if at least 8 days before passage in each house, or at least 12 days before passage in each house if the previous form of the bill did not amend this title, the bill in its final form has been delivered to the commission for distribution to the news media and to every person who has requested the commission to send copies of such bills to that person.

(b) This title may be amended or repealed by a statute that becomes effective only when approved by the electors.