Okla. Stat. tit. 12, § 12-615: Appointment of referee

In all cases of reference, the parties, except when an infant

may be a party, may agree upon a suitable person or persons, not

exceeding three, and the reference shall be ordered accordingly; and

if the parties do not agree, the court shall appoint one or more

referees, not exceeding three, who shall be free from exception.