The bonds, the issuance of which is provided in the preceding sections, shall be signed by the president, attested by the clerk and registered by the treasurer of the board of education, and shall have endorsed thereon a certificate signed by the county clerk and the district attorney of the county wherein such district is located, stating that said bonds or evidence of debt are issued pursuant to law and that said issue is within the debt limit.
Okla. Stat. tit. 70, § 15-105