Okla. Stat. tit. 21, § 54
Every person who has been convicted in any other State, government or country of an offense which, if committed within this State, would be punishable by the laws of this State by imprisonment in the penitentiary, is punishable for any subsequent crime committed within this State, in the manner prescribed in Section 434, 435, 436 of this act, and to the same extent as if such first conviction had taken place in a court of this State.
R.L. 1910, § 2808; Amended by Laws 1997, HB 1213, c. 133, § 15 (effective date amended to July 1, 1999, by Laws 1998, 1st Extr. Sess., HB 1002, c. 2, §§ 23-26, emerg. eff. June 19, 1998) (superseded document available); Amended by Laws 1999, HB 1009, c. 5, § 6, emerg. eff. July 1, 1999 (superseded document available).