California Codes, Code of Civil Procedure - CCP, Part 2 — Of Civil Actions, Title 6 — Of the Pleadings in Civil Actions, Chapter 2 — Pleadings Demanding Relief, Article 4 — Cross-Complaints, Section 428.60
A cross-complaint shall be served on each of the parties in an action in the following manner:
(1) If a party has not appeared in the action, a summons upon the cross-complaint shall be issued and served upon him in the same manner as upon commencement of an original action.
(2) If a party has appeared in the action, the cross-complaint shall be served upon his attorney, or upon the party if he has appeared without an attorney, in the manner provided for service of summons or in the manner provided by Chapter 5 (commencing with Section 1010) of Title 14 of Part 2 of this code.
Notes
Requires a cross-complaint to be served on every party, using summons-style service on parties who have not appeared and service on counsel, or directly on a self-represented appearing party, for those who have appeared. Appearing parties may be served under summons procedures or the referenced general service chapter.
Use as reference
Lexinter.net | California Code, Code of Civil Procedure - CCP § 428.60 | https://laws.lexinter.net/codes/california/code-of-civil-procedure/part-2/title-6/chapter-2/article-4/section-428-60