California Code, Business and Professions Code - BPC § 10018.14

“Listing agreement” means a written contract between a seller of real property or a business opportunity and a real estate broker by which the broker has been authorized to sell the real property or find or obtain a buyer, including rendering other services for which a real estate license is required to the seller pursuant to the terms of the agreement.  A “listing agreement” includes an “exclusive right to sell listing agreement,” “seller reserved listing agreement,” and “open listing agreement.”