Mo. Rev. Stat. § 474.190
474.190 Form of election, filing.
474.190. Form of election, filing. — The election to take the share hereinbefore provided shall be in writing, signed and acknowledged by the surviving spouse or by the guardian ad litem or conservator of his estate and shall be filed in the office of the clerk of the court. It may be in the following form:
(L. 1955 p. 385 § 255, A.L. 1983 S.B. 44 & 45)