American Bar Association Model Rules of Professional Conduct - Rule 7.2. Advertising
(a) Subject to the requirements of Rules 7.1 and 7.3, a lawyer may advertise services through written, recorded or electronic communication, including public media.
(b) A lawyer shall not give anything of value to a person for recommending the lawyer's services except that a lawyer may
(1) pay the reasonable costs of advertisements or communications permitted by this Rule;
(2) pay the usual charges of a legal service plan or a not-for-profit or qualified lawyer referral service. A qualified lawyer referral service is a lawyer referral service that has been approved by an appropriate regulatory authority;
(3) pay for a law practice in accordance with Rule 1.17; and
(4) refer clients to another lawyer or a nonlawyer professional pursuant to an agreement not otherwise prohibited under these Rules that provides for the other person to refer clients or customers to the lawyer, if
(i) the reciprocal referral agreement is not exclusive, and
(ii) the client is informed of the existence and nature of the agreement.
(c) Any communication made pursuant to this rule shall include the name and office address of at least one lawyer or law firm responsible for its content.