Tex. Government Code § 313.004: PROOF OF PUBLICATION OR POSTING.

(a) If publication of notice in a newspaper is required by law, proof of publication shall be made by the affidavit of the publisher accompanied by a printed copy of the notice as published.

(b) Proof of posting may be made by the return of the sheriff or constable or by the affidavit of a credible person made on a copy of the posted notice showing the fact of the posting.

Acts 1985, 69th Leg., ch. 479, Sec. 1, eff. Sept. 1, 1985.