California Rules of Professional Conduct
(http://www.calbar.ca.gov/state/calbar/calbar_generic.jsp?cid=10158&id=3422)

Rule 1-400.  Advertising and Solicitation
Rule 3-100.  Confidential Information of a Client

Evidence Code

Section 917.  Confidential Communications—Presumptions; Burden of Proof
Section 952.  Confidential Communication Between Client and Lawyer Defined

The State Bar Act
(http://www.calbar.ca.gov/state/calbar/calbar_generic.jsp?cid=10159&id=1285)

Article 4 – Admission to the Practice of Law (6060-6069) [Duties of Attorney (6068)]
(http://www.calbar.ca.gov/state/calbar/calbar_generic.jsp?cid=10159&id=1269#6068)
Article 9.5 – Legal Advertising (6157-6159.2)
(http://www.calbar.ca.gov/state/calbar/calbar_generic.jsp?cid=10159&id=8221)

California Attorney Guidelines of Civility and Professionalism
(http://www.calbar.ca.gov/calbar/pdfs/reports/Atty-Civility-Guide.pdf)